Answer:
a) 0.159
b) 0.0281
c) 0.816
Explanation:
We are given the following information in the question:
Mean, μ = 19.2 inches
Standard Deviation, σ = 1.2 inch
We are given that the distribution of lengths is a bell shaped distribution that is a normal distribution.
Formula:

a) P(baby will have a length of 20.4 inches or more)



Calculation the value from standard normal z table, we have,

b) P( baby will have a length of 21.5 inches or more)

Calculating the value from the standard normal table we have,

c)P(baby will have a length between 17.6 and 20.8 inches)

