R Marks obtained by 40 students in a short assessment are given below- Find -a- - -b- Marks 5 6 7 8 9 No- of students 6 A 16 13 B

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Finding Mean for Grouped Data When Class Intervals Are Not Given

r Marks obtai...

Question

Marks obtained by 40 students in a short assessment are given below. Find ‘a’ & ‘b’

mean = 7.2

a = 1; b = 4

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a = 1; b = 2

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a = 2; b = 3

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a = 2; b = 2

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a = 5; b = 0

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Similar questions

Marks	Below 20	20-40	40-60	60-80	Above 80
No of students	0	5	22	25	16

The marks scored by 60 students in a mathematics test are given below.

Marks (X)	10	20	30	40	50	60
No. of students (f)	8	12	20	10	7	3

Find the Variance and Standard Deviation of the marks.

Marks	0-19	20-39	40-59	60-79	80-99
No. of students	4	8	32	16	8

Marks	0−4	4−8	8−12	12−16	16−20	20−24
No. of Students	7	9	16	8	6	4

Marks	10−20	20−30	30−40	40−50	50−60	60−70	70−80	80−90
No. of students	7	13	20	25	10	8	6	1

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