Question

The weight of male babies less than 2 months old in the United States is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. Use the Tl—84 calculator and round your answers to two decimal places. Part 1 out of 3 Find the 79th percentile of the baby weights The 79th percentile of the baby weights is pounds. The weight of male babies less than 2 months old in the United States is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. Use the Tl—84 calculator and round your answers to two decimal places. Part 1 out of 3 Find the 79th percentile of the baby weights The 79th percentile of the baby weights is what pounds.

Answer 1

Solution:

we are given that: The weight of male babies less than 2 months old in the United States is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds.

That is: Mean =

Standard Deviation =

We have to use  Tl—84 calculator to find answer for following:

We have to find the 79th percentile of the baby weights.

That is:

P( X < x) = 79%

P( X < x) = 0.79

So use following steps in TI - 84 plus calculator:

1) Press 2ND

2) Press VARS ( DISTR)

3) Select invNorm(

4) Enter the numbers:

Area : 0.79

Click on Paste and Press Enter Two times:

which gives answer 13.67734

Thus answer rounded to 2 decimal places is: 13.68

The 79^th percentile of the baby weights is 13.68 pounds.