Word Count : 513

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i) Mean -

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Class Interval	Exact Units of Class Interval	Mid-Point (x)	Frequency (f)	Deviation from the AM (x)	fx
295-299	295.5-299.5	297	2	5	10
290-294	290.5-294.5	292	3	4	12
285-289	285.5-289.5	287	1	3	3
280-284	280.5-284.5	282	4	2	8
275-279	275.5-279.5	277	10	1	10
270-274	270.5-274.5	272	8	0	0
265-269	265.5-269.5	267	5	-1	-5
260-264	260.5-264.5	262	4	-2	-8
255-259	255.5-259.5	257	1	-3	-3
250-254	250.5-254.5	252	3	-4	-12
245-249	245.5-249.5

57	56	81	60	63	62	55	53
60	72	87	62	78	67	77	63
70	62	92	91	88	80	78	73
88	79	80	80	76	74	70	83
55	56	71	71	87	82	80	93

 

Compute the following from given frequency distribution:

i) Mean;

ii) Median;

iii) Variance and

iv) Standard Deviation

Class Interval	Frequency (f)
295-299	2
290-294	3
285-289	1
280-284	4

 

275-279	10
270-274	8
265-269	5
260-264	4
255-259	1
250-254	3
245-249	2
240-244	6