Solve the problem.
-Among a random sample of 400 college students, the mean number of hours worked per week at non-college related jobs is 14.4. This mean lies 2.8 standard deviation(s)above the mean of the sampling distribution. If a second sample of 400 students is selected, what is the probability that for the second sample, the mean number of hours worked will be less than 14.4?
A)0.9974
B)0.0026
C)0.9965
D)0.5

Question

Quizplus · Accepted Answer

The z-score for the first sample is 2.8, which corresponds to a probability of 0.9974 in the standard normal distribution. This means that there is a 0.9974 probability that the mean number of hours worked in the second sample will be less than 14.4.

Solve the Problem. -Among a Random Sample of 400 College Students, the Mean