probability and salary

Question

The mean annual salary of school bus drivers is $26,000 with a standard deviation of $5,000.

A) What is the probability of randomly selecting a single driver making under $25,000?
I have .4207

B) What is the probability of randomly selecting a sample of 36 drivers with an average salary under $25,000.
I have .579

C) Would either result be considered unusual? Why?
i think a would be unusual but im not sure

Answer 1

z = 25K -26K/5K = 1/5 =- .2

use z tables to find the area under the curve to the left of z =-2

42.074% chance of less than $25,000

sample of 36 means z = -1/(5/sqr36) = -6/5 = -1.2

probability = 11.507% to get sample average of 25K or less

the larger the sample, the less the probability