Question

the spreadsheet shows exam scores for one class.
find the mean for all exam 2 scores. (round to one decimal place.)
the mean for all exam 2 scores, rounded to one decimal place, is approximately %

Explanation:

Step1: Sum up all Exam 2 scores

$$3 + 29+44 + 22+78+68+81+33+66+37+3+61+60$$
$$=(3 + 29)+(44 + 22)+(78+68)+(81+33)+(66+37)+(3+61)+60$$
$$=32+66+146+114+103+64+60$$
$$=(32+66)+146+(114+103)+(64+60)$$
$$=98+146+217+124$$
$$=(98+146)+(217+124)$$
$$=244+341$$
$$ = 585$$

Step2: Count the number of data points

There are 13 students, so \(n = 13\)

Step3: Calculate the mean

The formula for the mean \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\)
Substitute \(\sum_{i=1}^{n}x_{i}=585\) and \(n = 13\) into the formula: \(\bar{x}=\frac{585}{13}=45.0\)

Answer:

\(45.0\)