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Normal Distribution
Page 4
Questions (2,069)
Suppose x has a normal distribution with sigma = 1.2. Find the minimal sample size required so that for a 95% confidence
3 answers
asked by
Anonymous
3,227 views
The average number of calories in a 1.5 ounce chocolate bar is 225. Suppose that the distribution of calories is approximately
4 answers
asked by
Kath
4,612 views
The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 115 and a variance of 25.
3 answers
asked by
Mary Ann
1,245 views
A company that manufactures and bottles apple juice has a machine that automatically fills 16-ounce bottles. There is some
4 answers
asked by
a
1,967 views
The life span of a DVD player produced by one major company is known to be normally distributed with a mean of 6.2 years. If
2 answers
asked by
ananya
1,262 views
The scores of students on standardized test are normally distributed with a mean of 300 and a standard deviation of 40. Between
3 answers
asked by
Nancy
1,684 views
Times for an ambulance to respond to a medical emergency in a certain town are normally distributed with a mean of 450 seconds
4 answers
asked by
Bella
3,454 views
LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life
4 answers
asked by
Mark
2,068 views
if the heights of men follow a normal distribution, and 99.7% fall between 5" and 7" what is the estimate standard deviation of
4 answers
asked by
lena
2,374 views
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 83 minutes
4 answers
asked by
Kelsey
4,396 views
2. Suppose that people’s weights are normally distributed, with mean 175 pounds and a standard deviation of 6 pounds. Round to
4 answers
asked by
lynda
1,435 views
2) From the records of XYZ University, there were 1564 freshmen students who took the IQ test during 1st
Sem of S.Y. 2018 - 2019.
4 answers
asked by
arjon
1,300 views
Random variable X is normally distributed with mean 10 and standard deviation 2.
Compute the following probabilities. a. Pr(X<10)
3 answers
asked by
Sally
868 views
Suppose that the number of insects captured in a trap on
different nights is normally distributed with mean 2950 and standard
1 answer
asked by
Lindz
541 views
The weights of black bears are normally distributed with a mean of 264 kg and a standard deviation of 38 kg. Let X be the weight
2 answers
asked by
SHEILA
752 views
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a
3 answers
asked by
Alex
4,848 views
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We
3 answers
asked by
ryan
2,261 views
A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution
9 answers
asked by
anoneemose
2,244 views
The distribution of the number of viewers for the American Idol television show follows a normal distribution with a mean of 27
2 answers
asked by
Murry
826 views
A fitness company surveyed the weights of its 90 costumers. Assume that the weights are normally distrubted with a mean of 162
2 answers
asked by
devon
1,132 views
Bass: The bass in Clear Lake have weights that are normally distributed with a mean of 2.3 pounds and a standard deviation of
3 answers
asked by
robin
1,136 views
For a skewed distribution, what is the approximate percentage of data values that are within 2 standard deviations
4 answers
asked by
Luke
813 views
8) A consumer groups tries to determine the most expensive items in a convenience store. Four items are
purchased in the
4 answers
asked by
Kay
2,093 views
What percentage of the area of the standard normal distribution is between z = -1.00 and z = +1.00? How do you know this?
6 answers
asked by
Jen
2,603 views
A normal distribution has a mean of 120 and a standard deviation of 20. What score separates the top 40% of the scores from the
5 answers
asked by
Anonymous
4,071 views
Mrs. Smith's reading class can read an average of 190 words per minute with a standard deviation of 20 words per minute. The top
3 answers
asked by
Clarke
971 views
What is the probability of randomly selecting a z-score less than z = –0.80 from a normal distribution.
a)-0.2119 b)0.7881
4 answers
asked by
Jane Segurra
3,837 views
Find the area of the normal curve given the following: z = 2.38 to z = 3.09
7 answers
asked by
Hazel
1,807 views
if height of 300 students is normally distributed with mean 68.00 inch and standard deviation 3.0 in ch. how manystudents have
5 answers
asked by
qamar
3,156 views
Instant dinner comes in packages with weights that are normally distributed with a standard deviation of 0.3 oz. If 2.3 percent
5 answers
asked by
missy
1,882 views
The heights of American women between the ages of 18 and 24 are approximately normally distributed. The mean is 64.1 inches, and
5 answers
asked by
Comet
2,406 views
The average length of time, per week, that students at a certain university spend on homework is normally distributed with a
4 answers
asked by
Jordan
1,251 views
Supplier on-time delivery performance is critical to enabling the buyer’s organization to meet its customer service
4 answers
asked by
Priya
1,752 views
IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the x- score that corresponds to
6 answers
asked by
chalulu
14,302 views
Scores on a certain exam are normally distributed with a mean of 78 and a variance of 25. What is the score obtained by the top
5 answers
asked by
Julie
3,746 views
(GRAPH) Sketch a normal curve that has a mean of 15 and a standard deviation of 4. On the same x-axis, sketch another normal
7 answers
asked by
Sylvia
4,642 views
Fast Auto Service provides oil and lube service for cars. It is known that the mean time taken for oil and lube service at this
5 answers
asked by
Karinna
6,646 views
Assume that X, the starting salary offer to psychology majors is normally distributed with a mean of $47,507 and a SD of $5000.
1
5 answers
asked by
Jolie
5,805 views
set of data is normally distributed with a mean of 200 and standard deviation of 50.
· What would be the standard score for a
5 answers
asked by
Laynette
3,602 views
The scores on a math test are normally distributed. if the mean is 72 and the standard deviation is six, what is the range of
4 answers
asked by
Barb
2,807 views
Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of
4 answers
asked by
Dawn
2,736 views
Find the 35th percentile of the normal distribution with mean 270 and SD 25.
5 answers
asked by
James
1,883 views
the life time of a certain kind of mean life of 400 hours and standard deviation of 45 hours. assuming the distribution of life
4 answers
asked by
Priya
1,577 views
Please let me know if I solved this right
The lifetime of television produced by the Hishobi Company are normally distributed
5 answers
asked by
Holly
2,641 views
The weights of the fish in a certain lake are normally distributed with a mean of 15lbs. and standard deviation of 6lbs. If a
5 answers
asked by
Amy
12,123 views
The actual weights of bag of pet food are normally distributed.The mean of the weights is 50.0 lb,with a standard deviation of
5 answers
asked by
Anonymous
3,521 views
Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of
4 answers
asked by
Amy
10,868 views
When red blood cells are counted using a certain electronic counter, the standard deviation (SD)
of repeated counts of the same
4 answers
asked by
Sarah
2,190 views
If X is a random variable which is normally distributed with a mean of 100, then P(X<100)=P(X>100)
True or False?
5 answers
asked by
Leslie
1,879 views
If a sample with M = 50 and s = 10, the X value corresponding to z = 1.50 is X = 65?
4 answers
asked by
Michell
1,731 views
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