The following data set represents a recent set of test scores in a Chemistry Class.
90, 90, 95, 100, 80, 80, 75, 80, 70, 60, 95, 100, 100, 100, 75, 80, 90, 90, 90, 70, 70, 80, 85, 90, 90, 85
Use a statistics calculator (Links to an external site.) to find the mean and standard deviation (round to nearest tenth) of the data set.
Mean:
Sample Standard Deviation:
Sketch out the following diagram to help you solve the problem and label the mean and three standard deviations from the mean in both directions.
Use the diagram above, and the mean and standard deviation you calculated to answer the following questions using the empirical rule.
a) How many students in the chemistry class (meaning how many of the 26 students) scored within 1 Standard Deviation of the mean? How does this compare to what the Empirical Rule says should happen?
b) How many students in the chemistry class (meaning how many of the 26 students) scored within 2 Standard Deviation of the mean? How does this compare to what the Empirical Rule says should happen?
 👍
 👎
 👁
 ℹ️
 🚩
1 answer

Cannot diagram on these posts. Cannot copy and paste here.
 👍
 👎
 ℹ️
 🚩
answered by PsyDAG
Answer this Question
Related Questions

math
If someone asked: what can we learn from analyzing the standard deviation of a set of data that we couldn't learn from just looking at the measures of average, how would I answer? I know that average is the value or number in the middle of the data set and
 asked by Carly

Check Math Answers!!
1.Find the mean: 12, 8, 7, 10, 8, 8, 10 A)63 B)12.6 C)9** D)7 2.The sixthgrade classes have 28, 20, 30, and 25 students. What is the mean number of students in a class? A)25.75** B)26.25 C)25 D)27 3.The mean of four numbers is 30. If three of the numbers
 asked by JacqueesWifee

Pre Algebra Plz help asap!:)
1.Which set represents a Pythagorean triple? 27, 38, 42 33, 44, 55*** 35, 38, 42 68, 72, 81 2.Which number completes the Pythagorean triple: 12, 16, ____? 18 20*** 22 24 3. Which set represents a Pythagorean triple? 1, 2, 4 2, 4, 6 3, 4, 10 5, 12, 13***
 asked by Labbayk

Math
Find the mean of the data set. If necessary, round to the nearest tenth. 15.8, 14.9, 17.6, 13.4. A) 15.7 ***** B) 16.2 C) 16.7 D) 19.6 Erin wrote the following set of numbers. 37, 22, 37, 19, 34, 22, 37, 22, 32, 26, 30, 22 What is the mode of this set of
 asked by Jeremiah

Math Help me PLZ!
1: What is the median of the data set: 25,8,10,35,5,45,40,30,20 A:10 ~ B:22.5 C:25 D:27.5 2: What is the upper quartile of the given data set: 25,8,10,35,5,45,40,30,20 A:35 B:37.5 ~ C:37 D:40 3: What is the lower quartile of the given data set:
 asked by Candy

Math
In yourâ€‹ class, you have scores of 73,85,76, and 92 on the first four of five tests. To get a grade of Upper C, the average of the first five tests scores must be greater than or equal to 70 and less than 80. a) Solve an inequality to find the least
 asked by Ms. E

algebra
The mean of a data set is 7.8, the made is 6.6, and the median is 6.8. What is the least possible number of data values in the set? A 3 data values B 4 data values C 5 data values D 6 data values I'm not really sure how I'm supposed to figure this out but
 asked by Anonymous

Math
Find the mode of the set of data 59,61,54,51,38 46,56,52,63,40,44 1.B 2.D 3.C 4.A 5.D 6.C 7.B 8.C 9.C 10.C 11.B 12.D 13.B 14.A 15.A 16.A 17.D 18.A 19.C 20.D Math lesson:10 Unit:2 Practice test 100% answers
 asked by May

math
The following is a set of data from a sample of n = 5: 7 4 9 8 The following is a set of data from a sample of n = 5: 7 4 9 8 2 a. Compute the mean, median, and mode. b. Compute the range, variance, standard deviation, and coefficient of variation. c.
 asked by dannie0913

statistics
If I know that a set of test scores has a mean of 75 and a standard deviation of 8 what can I conclude?
 asked by allison

math
The stemandleaf plot shows the test scores of a science class. How many students scored 78? science test scores 6: 8,8,9 7:2 ,5,5,5,8,8,8,8,9 8: 2,2,2,6,6,9,9 9: 0,0,0,2,2,5,5,5 key: 8/2 or 8 and 2 means 82 is the answer 1 or 2 or 3 or 4 and also this
 asked by help

Math
The boxandwhisker plots show data for the test scores of four groups of students in the same class. Which plot represents data with the greatest range or scores? A. The lowest value is numberd 30, the lower quartile is numberd at 40, the median is
 asked by Anonymous

STATISTICS
For a 10 point quiz, the professor recorded the following scores for 8 students: 7, 8, 3, 9, 10, 6, 8, 5 What is the Mean for this set of scores?
 asked by Jake

Math 6 A
1. Three of the four images represent the same data set. Which one does NOT? Data displays A. image A B. image B C. image C D. image D 2. What is the mode of this data set? List A. 3 B. 7 C. 10 D. 13 3. What statistic is shown by the red line on the dot
 asked by PERSON

Math
1. Find the mean of the data set. If necessary, round to the nearest tenth. 17.2, 18.3, 14.9, 16.8, 15.3 A) 3.4 B) 16.5 C) 16.8 D) 17.2 2. Erin wrote the following set of numbers. 37, 22, 37, 19, 34, 22, 37, 22, 32, 26, 30, 22. What is the mode of this set
 asked by Violent

Statistics
I you are told that a data set has a mean of 25 and a variance of 0 you can conclude that A)There is only one observation in the data set B) There are no observations in the data set C)All of the observation in the data set are 25 D)Someone has made a
 asked by Dom

Algebra
Your test scores in one class are 81 and 87. What possible scores can you earn on your next test to have a test average between 84 and 89, inclusive?
 asked by Lindsey

Math
what number could be included in the data set 9,12,17,15,13, so that the MEDIAN of the numbers in the set result in 14?
 asked by die

Math. plz help or try.
I would love it if you helped me. 1. Determine the median of this data set. 5,6,3,2,2,4,8,9 A. 2 B. 4.5 C. 5.5 D. 5 2. What is the mode of the data set? 27,35,57,36,44,57,33,34,66,30,33,42,57,23,35 A. 35 B. 33 C. 42 D. 57 3. Sam conducted a survey in which
 asked by Kat

Algebra 1 Just one question please :)
You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data set is 0.015. How confident can you be that your predicted value will be reasonably close to the actual value? Please help
 asked by basketball&batman
Still need help?
You can ask a new question or browse existing questions.