A General Electric soft white 3-way bulb has an average life of 1200 hours with a standard deviation of 50 hours. Find the probability that the life of one of these bulbs will be between 1150 and 1300 hours.
You need to change the times to Z-scores â€” scores given in terms of standard deviations.
Z = (X - µ)/SD, where X is the particular value, µ = the mean and SD is the standard deviation.
Once the Z scores are obtained, look it up in a table in the back of your statistics textbook called something like "areas under the normal distribution." Find the proportions between those Z-scores and the mean for both values and add them together to get the probability that the life of the bulb will be between these two values.
Although I did not solve the problem completely for you, I did tell you the process for reaching a solution. This will mean that you will have to exert a little more effort, time and thinking, but I hope it will help you to learn more.
I hope this helps. Thanks for asking.
did you get the answer now?
Answer this Question
If a musician sees MP in his part, which dynamic level should he play? Very soft Medium soft Soft Medium loud
- asked by ?
Ammonia fumes can permanently fog soft contact lenses. Briefly explain why students wearing soft contact lenses should be particularly careful when doing this experiment.
- asked by Liv
For 4 weeks, William volunteered as a helper for swimming classes. The first week, he volunteered for 8 hours. He volunteered for 12 hours in the second week, and another 12 hours in the third week. The fourth week, he volunteered for 9 hours. For how many
- asked by Anonymous
A carload of fraternity brothers leaves their house for a long weekend road trip. Two hours later a second carload of brothers leaves the same house and travels the same path. If the second car drives an average of 15 mph faster than the first, what is the
- asked by Rose
The intensity I of light bulb measured in watts per square meter (w/m^2), varies inversely as the square of the distance d from the light bulb . . suppose I is 45 w/m^2 when the distance is 5 m . find the intensity when the distance from the light bulb is
- asked by Ann
1.Unicellular cells must carry out ___ of life. A.a single function B.a few functions C.all functions D.specific functions 2. Which statement about multicellular organisms is correct? (1 point) A. A multicellular organism has many specialized cells. B.The
- asked by pls help
Suppose you are driving to visit a friend who lives far away. You are driving at an average rate of 55 miles per hour. You must drive a total of 295 miles. If you have already driven 20 miles, how long will it take you to reach your destination? A) 2 hours
- asked by Anonymous
A 100W light bulb is left on for 10hrs. Over this period of time how much energy is used by the bulb? am i doing this right? my guess is to convert 100W to kW and convert 10 hrs to seconds and multiply the 2 together? which gives 3600J or should i just
- asked by Physics
Electric bulb is Marked 60 watts 120 volt what is the resistance of filament of bulb
- asked by Sunny
math with application
If 12 % of a radioactive substance decays in 7 hours, what is the half-life of the substance? Carry out all calculations exactly, then round the final answer to three decimal places. The half life is what hours?
- asked by liv
A market analyst creates a taste test to be conducted in a local shopping mall. The experiment asks 500 participants to select which of 2 soft drinks they prefer. The drinks are the same color and in similar cups. Participants record their preferred drink
- asked by Abbyy
1. Iodine-131 is used to find leaks in water pipes it has a half life of 8.14 days. If 36 days have passed and there is now 2.34g left. What is the initial amount? 2. Sr-85 is used in bone scans and has a half life of 64.9 days. If there is 23 percent of
- asked by Scott
Find the half-life (in hours) of a radioactive substance that is reduced by 30 percent in 40 hours.
- asked by Urgent help
Labels for Illustration of the Life Cycle of an Average Star You are making an illustration of the life cycle of an average star and the life cycle of a massive star as part of a computer animation. Drag each item to indicate whether it is a label for an
- asked by rick
Which of the following statements about electric field lines due to static charges are true? (Select all that apply.) Electric field lines can never cross each other. Static charges can create closed loop electric field lines that do not begin or end on a
- asked by mathew
Potassium-42 has a half life of 12.4 hours. How much of an 848 g sample of potassium-42 will be left after 62.0 hours? Please help me!!
- asked by Cindy
Find the half-life (in hours) of a radioactive substance that is reduced by 30 percent in 80 hours
- asked by Cooper
A 75-W, 120-V bulb is connected in parallel with 25-W, 120-V bulb. What is the net resistance?
- asked by Allen
A purchasing agent for a trucking company is shopping for replacement tires for their trucks from two suppliers. The suppliers' prices are the same. However, Supplier A's tires have an average life of 60,000 miles with a standard deviation of 10,000 miles.
- asked by Tykrane
Probability & Statistics
The life expectancy (in hours) of a fluorescent tube is normally distributed with a mean 8000 and a standard deviation 1000. Find the probability that a tube lasts for more than 11000 hours.
- asked by Gen