Question

Suppose weight of a baby less than 2 months is normally distributed with mean 11.5 lbs and standard deviation 2.7 lbs, what proportion of babies weigh less than 11.07 lbs?

Answer 1

Explanation:

First calculate the z-score.

z = (x − μ) / σ

z = (11.07 − 11.5) / 2.7

z ≈ -0.16

From a z-score table:

P(z<-0.16) = 0.4364

The proportion of babies that weigh less than 11.07 lbs is 0.4364.