3. Furnace repair bills are normally distributed with a mean of 269 dollars and a standard
deviation of 20 dollars. If 64 of these repair bills are randomly selected, find the
probability that they have a mean cost between 269 dollars and 271 dollars.
a) 0.5517
b) 0.2119
c) 0.2881
d) 0.7881

There is a 28.81% probability that they have a mean cost between 267 dollars and 269 dollars.

Step-by-step explanation:

There is a 0.7881 - 0.50 = 0.2881 = 28.81% probability that they have a mean cost between 267 dollars and 269 dollars. Hope this helps and please rate and say thanks! :).

the answer is 0.5 mpm

step-by-step explanation:

the line goes half way through the square each time (which is 0.5 or half of course) so that would mean its 0.5 mpm.