Question

the weights, in kilograms, of 12 students in the ninth grade are listed in the chart below. what is the mean (average) weight of these students? answer

Explanation:

Step1: Sum up all the weights

$$58 + 63+54 + 65+72+65+70+75+63+72+59+65$$
$$=(58 + 54+59)+(63+63)+(65+65+65)+72+72+70+75$$
$$=(171)+(126)+(195)+72+72+70+75$$
$$=171+126 = 297$$
$$297+195=492$$
$$492+72 = 564$$
$$564+72=636$$
$$636+70 = 706$$
$$706+75=781$$

Step2: Divide the sum by the number of students

The number of students \(n = 12\). The mean formula is \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\). So \(\bar{x}=\frac{781}{12}\approx65.08\)

Answer:

\(65.08\)