The mean of marks secured by 25 students in section A of Class X is 47, that of 51 students section B is 51 and that of 30 students of section C is 53. Find the mean of marks of the students of three sections of Class X. |
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a) |
50 |
b) |
50.6 |
c) |
52.5 |
d) |
54.5 |

The mean of marks secured by 25 students in section A of Class X is 47, that of 51 students section B is 51 and that of 30 students of section C is 53. Find the mean of marks of the students of three sections of Class X. |
|||||||

a) |
50 |
b) |
50.6 |
c) |
52.5 |
d) |
54.5 |

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