Question

Suppose that the population average for weekly earnings for employees in general automotive repair shops is $450, and that the population standard deviation for the earnings for such employees is $50. A sample of 100 such employees is selected at random.

16) What is the probability distribution of the average weekly earnings of a sample of 100 for employees in general automotive repair shops?
a) Normal
b) Not enough information to determine

c) t-distributed.
d) None of the above

17) Find the probability that the average weekly earnings of a sample of 100 is less than $445. a) 0.46 b) 0.15 c) 0 d) 0.85

18) Find the probability that the average weekly earnings of a sample of 100 is exactly equal to $445.
a) 0.46 b) 0.15 c) 0 d) 0.85

19) Find the probability that the average weekly earnings of a sample of 100 is between $445 and $455.
a) 0.93 b) 0.07 c) 0.32 d) 0.68

Answer 1