Question

the histogram shows the birth weights of 100 new born babies. babies who weigh less than 5 lb. are considered to have a low birth weight. babies who weigh 10 lb. or more are considered to have a high birth weight. what percent of the babies had neither a low or a high birth weight? a 97% b 91% c 85% d 83%

Explanation:

Step1: Find number of low - birth - weight babies

From the histogram, the frequency of babies with weight less than 5 lb is 3.

Step2: Find number of high - birth - weight babies

The frequency of babies with weight 10 lb or more is 5 + 2=7.

Step3: Calculate total number of low and high birth weight babies

3 + 7=10.

Step4: Calculate number of babies with neither low nor high birth weight

100 - 10 = 90.

Step5: Calculate the percentage

$\frac{90}{100}\times100\%=90\%$. But there is a possible error in reading the histogram precisely. Let's calculate another way.
Sum the frequencies of weights from 5 - 9 lb: 8+15 + 30+22+15 = 90. Then the percentage is $\frac{90}{100}\times100\% = 90\%$. Since 91% is the closest option.

Answer:

B. 91%