The table below shows the scores on a math test.
david
75
aaron
75
ashley
60
gina
75
andrew
75
kei
95
monica
100
anna
60
lucas
75
jennifer
65
the number of standard deviations between a score and the mean score is indicated by a z-score. what was ashley’s z-score on the math test?
a.
1.1
c.
–1.1
b.
60
d.
–15.5

C) –1.1            

Step-by-step explanation:

We are given the table showing the scores of the students on math test.

From the data,

Mean of the scores, μ =

i.e. Mean, μ =

i.e. Mean, μ =

i.e. Mean, μ = 75.5

Then, Standard deviation of the scores, σ = 12.5

Since, the value of Ashley's score, x = 60

Thus, the z-score is given by

i.e.

i.e. z = -1.1.

Hence, the Ashley's z-score on the test is -1.1