Furnace Repair Bills Are Normally Distributed with a Mean of 267

Multiple Choice

Furnace repair bills are normally distributed with a mean of 267 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 267dollars and 269 dollars.

A) 0.2881
B) 0.7881
C) 0.2119
D) 0.5517