Answer:
Solution
x f fx
65 4 260
70 2 140
75 2 150
80 1 80
85 7 595
90 5 450
total N=21 Summation fx=1675
We know
Mean= Summation fx/N
=1675/21
=79.8
Hence, the required mean is 79.8 ans.
The scores of students on a recent exam. The mean of the scores is 51.42857.
The mean is the ratio of addition of all the observation values and the number of observations.
The mean of the score is equal to
Mean = {(65×4)+(70×2)+(75×2)+(80×1)+(85×7)+(90×5)} / (4+2+2+1+7+5)
Mean = 51.42857
Therefore, the mean of the scores is 51.42857.
Learn more about mean.
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