Question

A student earned the scores in the data set in one course. {90, 87, 58, 79, 91} What is the mean of the scores? 33 58 81 87

Answer 1

81

Explanation:

Mean is the sum of all numerical data values over the number of data. In this problem, we have total of 5 numerical data. Therefore:

`\displaystyle{\bar{x} = (\sum x)/(N)}\\\\\displaystyle{\bar{x} = (90+87+58+79+91)/(5)}\\\\\displaystyle{\bar{x} = (405)/(5)}\\\\\displaystyle{\bar{x} = 81}`

Note:

`\bar{x}` is mean value,
`\displaystyle{\sum x}` is sum of data, N is number of data

Answer 2

81

Explanation:

Mean means the average

Mean = (sum of #s) / amount of #s

sum of numbers = 90 + 87 + 58 + 79 +91 = 405

amount of #s = 5

405/5 = 81