Question

finding the mean
the national average height for girls in the sixth grade is also 52 inches. find the average height of the girls in this class.
the total number of girls is.
the total height of the girls is inches.
the expression to find the mean is.
the average height of the girls in this class is inches.

number of girls	height in inches	total height
8	52	416
0	53	0
4	54	216
totals

Explanation:

Step1: Calculate total number of girls

$2 + 8+0 + 4=14$

Step2: Calculate total height of girls

$102+416 + 0+216 = 734$

Step3: Write expression for mean

The mean $\bar{x}=\frac{\text{Total height}}{\text{Total number of girls}}=\frac{734}{14}$

Step4: Calculate the mean

$\frac{734}{14}\approx52.43$

Answer:

The total number of girls is 14.
The total height of the girls is 734 inches.
The expression to find the mean is $\frac{734}{14}$.
The average height of the girls in this class is approximately 52.43 inches.