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Answer:

FORMULA OF MEAN=

[tex] = \frac{sum \: of \: all \: observation}{total \: number \: of \: observation} [/tex]

PUT VALUE FROM QUESTION

[tex] = \frac{42 + 74 + 62 + 38 + 48 + 84 + 45 + 56 + 68 + 70}{10} [/tex]

[tex] = \frac{587}{10} [/tex]

[tex] = 58.7[/tex]

THE MEAN MARks IS 58.7

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ur answer

42+74+62+38+48+84+45+56+68+70

10

= 587

10

So, the mean marks = 58.7