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Mathematics, 11.12.2021 05:50 fmw812

CASE : An electrical company claims that the average life of the bulbs it manufactures is 1200 hours with a standard deviation of 250 hours. If a random sample of 100 bulbs is chosen, what is the probability that the sample mean will be :

a. greater than 1150 hours?

b. less than 1250 hours?

c. between 1150 and 1250 hours ?

REMINDERS :

1. Make sure that you follow the step-by-step solutions in solving probability problems of sample means.

2. Don't forget to shade and label the probability distribution (graph).

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