Question

A newborn baby's weight is recorded each month, from the day of birth until 12 months. one baby's weights, in pounds, are recorded below: 7.20, 9.15, 11.01, 12.56, 14.04, 15.43, 16.52, 17.68, 18.77, 19.69, 20.22, 21.05, 21.90 what is the average amount of monthly weight gain, rounded to the nearest hundredth of a pound, each month?

a. 1.13
b. 15.79
c. 1.23
d. 16.52

Answer 1

The average monthly weight gain for the baby is calculated by subtracting the birth weight from the weight at 12 months and dividing by 12. The result is 1.23 pounds, after rounding to the nearest hundredth.

Step-by-step explanation:

To calculate the average amount of monthly weight gain for the baby, we will subtract the weight of the baby at birth from the weight at 12 months, and then divide that total gain by the number of months, which is 12.

First, we take the final weight and subtract the birth weight: 21.90 pounds (weight at 12 months) - 7.20 pounds (birth weight) = 14.70 pounds (total weight gained over 12 months).

Then, we divide the total weight gained by the number of months: 14.70 pounds / 12 months = 1.225 pounds per month.

Rounding this to the nearest hundredth, we get an average monthly weight gain of 1.23 pounds. Therefore, the correct answer is c. 1.23.

Answer 2

15.79

Step-by-step explanation:

To find the average amount of monthly weight gain, we need to find the average first.

Average is defined as the sum of the values (in our case value of weight in each month) and that sum divided by the number of values (in our case it is the number of months).

Finding the average:

`A=(7.20+9.15+11.01+12.56+14.04+15.43+16.52+17.68+18.77+19.69+20.22+21.05+21.90)/(13)`

Since there are 13 values so we sum up all the values and divided by the number of values.

`A=(205.22)/(13)=15.786\approx15.79`

When rounded to the nearest hundredth of a pound we get 15.79 pounds.