In a class test, in mathematics, 10 students scored 75 marks, 12 … - Vidyadip

MCQ

In a class test, in mathematics, $10$ students scored $75$ marks, $12$ students scored $60$ marks, $8$ scored $40$ marks and $3$ scored $30$ marks. The mean of their score is (approximately) .......

✓
$57$ marks
B
$56$ marks
C
$15$ marks
D
$54$ marks

✓

Answer

Correct option: A.

$57$ marks

Total marks obtained by all students $= 10 \times 75 + 12 \times 60 + 8 \times 40 + 3 \times 30 = 1880$
The total number of students $= 10 + 12 + 8 + 3 = 33$ Average of their score
$ = \frac{1880}{33} = 56.96969697 ($aproximately$)$

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