EXERCISE 1. The AM of the series C.CC. The mean of marks obtained in an examination by a group of 100 students was found to be 40

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The mean marks obtained in an examination by a group of 100 students were found to be 49.46. The mean marks obtained in the same examination by another group of 200 students were 52.32. Find out the mean of marks obtained by both the groups of students taken together.

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Marks obtained by 100 students in an examination are given in the table:

Sl. No.	Marks obtained	Number of students
1	25	20
2	30	20
3	35	40
4	40	20

What would be the mean, median and mode of the marks obtained by the students?

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The marks obtained by 100 students of a class in an examination are given below:

$\begin{matrix} M a r k s & N u m b e r o f s t u d e n t s 0 - 5 & 2 5 - 10 & 5 10 - 15 & 6 15 - 20 & 8 20 - 25 & 10 25 - 30 & 25 30 - 35 & 20 35 - 40 & 18 40 - 45 & 4 45 - 50 & 2 \end{matrix}$

Draw cumulative frequency curves by using (i) 'less than's series and (ii) 'more than' series.

Hence,find the median.

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The mean marks obtained by

300

students in Mathematics are

45

. The mean of top

100

students was

70

and the mean of last

100

was known to be

20

. The mean of remaining

100

students is

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Find the mean, mode and median of marks obtained by

20

students in an examination. The marks are given below.

Marks	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$
No. of students	$1$	$4$	$5$	$8$	$2$

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