The marks obtained by 22 students of std 8 in a test of 80 marks are given below- Find the mean of the data-xi Tally Marks fi fi X xi 40 NN 5 5 - 40-200 50 NNI 6 6 - 50-300 55 1111 4 4 - 55-220 60 2 2 - 60-120 67 2 2 - 67-134 70 2 2 - 70-140 79 1 1 1 - 79-79 N-22 - fi xi-1193 A- 54-22B- 54-23C- 54D- 54-11

The correct option is B 54.23Mean (x̅) = ∑ f_i x_i /N = 1193/22 = 54.23 ...

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Arithmetic Mean from Frequency Table

The marks obt...

Question

The marks obtained by 22 students of std 8 in a test of 80 marks are given below. Find the mean of the data.

54.22

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54.23

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54.11

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Marks	10−20	20−30	30−40	40−50	50−60	60−70	70−80	80−90	90−100
Number of Students	4	10	16	22	20	18	8	2	5

Marks	10-20	20-30	30-40	40-50	50-60	60-70	70-80
Number of students	6	8	13	7	3	2	1

Marks	0-10	10-20	20-3	30-40	40-50	50-60	60-70	70-80
Number of students	3	5	16	12	13	20	6	5

Marks	20−25	25−30	30−35	35−40	40−45	45−50	50−55	55−60	60−65	65−70
Students	6	3	7	4	6	4	2	8	3	7

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