Question

The first practice test of 80 marks for the students of standard tenth
was conducted for a class of 36 students. The marks obtained by the
students were as follows. Find the mean of the marks,
80, 70, 60, 50, 46, 40, 28, 30, 32, 40, 34, 74
40, 74, 72, 32, 60, 72. 74, 50, 50, 80, 78, 78
76. 32. 30, 34, 69, 78, 80, 32, 70, 74, 46, 32​

Answer 1

Answer:

SORRY I DIDN'T ANSWER THESES TIME

Answer 2

Given :- The first practice test of 80 marks for the students of standard tenth was conducted for a class of 36 students. The marks obtained by the students were as follows. Find the mean of the marks,

80, 70, 60, 50, 46, 40, 28, 30, 32, 40, 34, 74

40, 74, 72, 32, 60, 72. 74, 50, 50, 80, 78, 78

76. 32. 30, 34, 69, 78, 80, 32, 70, 74, 46, 32

Answer :-

we know that,

• Mean = Sum of all observations / Total number of observations.

so,

→ Sum of marks of all students = 1997

→ Total number of students = 36 .

then,

→ Mean marks of students = Sum of marks of all students / Total number of students = 1997/36 = 55.47 (Ans.)

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