Normal distribution

Question

A manufacturer knows that their items have a normally distributed length, with a mean of 15.2 inches, and standard deviation of 1.6 inches.

If one item is chosen at random, what is the probability that it is less than 12.8 inches long?

Answer 1

p (X<12.8)

on a TI 84

2nd VARS

normalcdf

lower = -1E99

upper = 12.8

mean = 15.2

sd = 1.6

Paste

0.0668