Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	180
30 < x ≤ 50	195
50 < x ≤ 60	270
60 < x ≤ 80	300

[ mean =47.53]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	135
10 < x ≤ 30	180
30 < x ≤ 50	165
50 < x ≤ 60	270
60 < x ≤ 80	230

[ var =508.3]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 30	220
30 < x ≤ 50	210
50 < x ≤ 60	225
60 < x ≤ 80	240

[ Standard Deviation =21.51]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 30	250
30 < x ≤ 50	180
50 < x ≤ 70	375
70 < x ≤ 90	230

[ mean =47.22]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	150
10 < x ≤ 20	130
20 < x ≤ 40	240
40 < x ≤ 50	390
50 < x ≤ 60	220

[ var =283.2]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 30	160
30 < x ≤ 50	315
50 < x ≤ 60	240
60 < x ≤ 70	150

[ Standard Deviation =18.47]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	170
30 < x ≤ 40	210
40 < x ≤ 50	255
50 < x ≤ 60	220

[ mean =35.66]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	160
20 < x ≤ 40	420
40 < x ≤ 60	420
60 < x ≤ 70	240

[ var =364.5]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	105
10 < x ≤ 20	270
20 < x ≤ 40	195
40 < x ≤ 60	435
60 < x ≤ 70	110

[ Standard Deviation =19.04]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	280
30 < x ≤ 40	195
40 < x ≤ 60	435
60 < x ≤ 80	180

[ mean =41.09]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 30	200
30 < x ≤ 40	390
40 < x ≤ 50	180
50 < x ≤ 60	180

[ var =197.5]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 30	130
30 < x ≤ 40	405
40 < x ≤ 60	315
60 < x ≤ 80	250

[ Standard Deviation =19.95]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	210
20 < x ≤ 40	375
40 < x ≤ 50	330
50 < x ≤ 60	140

[ mean =33.28]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	135
10 < x ≤ 20	270
20 < x ≤ 30	450
30 < x ≤ 40	255
40 < x ≤ 60	160

[ var =161.8]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 20	220
20 < x ≤ 40	270
40 < x ≤ 60	405
60 < x ≤ 70	200

[ Standard Deviation =19.62]