Question

this morning Mr trevino released the scores from last week's spelling testx is the score that randomly chosen scored what is the expectef value of X

Answer 1

Answer

A randomly chosen score X has an expected value of 63.9​

Explanation

The expected value is calculated as the mean of the distribution

The mean is the average of the distribution. It is obtained mathematically as the sum of variables divided by the number of variables.

Mean = (Σx)/N

x = each variable

Σx = Sum of the variables

N = number of variables

Σx = (19 × 2) + (43 × 1) + (56 × 1) + (70 × 3) + (92 × 1) + (100 × 2)

Σx = 38 + 43 + 56 + 210 + 92 + 200

Σx = 639

N = 2 + 1 + 1 + 3 + 1 + 2 = 10

Mean = (Σx)/N

Mean = (639/10) = 63.9

Hope this Helps!!!