Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	220
30 < x ≤ 50	300
50 < x ≤ 60	315
60 < x ≤ 70	230

[ mean =41.43]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	210
30 < x ≤ 50	240
50 < x ≤ 70	150
70 < x ≤ 80	200

[ var =541.8]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 20	300
20 < x ≤ 30	315
30 < x ≤ 40	180
40 < x ≤ 50	120

[ Standard Deviation =11.09]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	170
30 < x ≤ 40	285
40 < x ≤ 50	450
50 < x ≤ 60	280

[ mean =39.07]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 30	130
30 < x ≤ 40	360
40 < x ≤ 50	180
50 < x ≤ 60	170

[ var =198.5]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 30	290
30 < x ≤ 40	150
40 < x ≤ 60	225
60 < x ≤ 70	260

[ Standard Deviation =19.91]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 20	100
20 < x ≤ 30	315
30 < x ≤ 50	240
50 < x ≤ 70	130

[ mean =32.04]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	260
30 < x ≤ 50	390
50 < x ≤ 60	240
60 < x ≤ 80	220

[ var =412.0]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	240
30 < x ≤ 50	240
50 < x ≤ 60	225
60 < x ≤ 70	110

[ Standard Deviation =18.64]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	240
30 < x ≤ 40	225
40 < x ≤ 50	330
50 < x ≤ 70	140

[ mean =36.09]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	190
30 < x ≤ 40	210
40 < x ≤ 50	420
50 < x ≤ 60	220

[ var =209.6]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	240
20 < x ≤ 30	150
30 < x ≤ 40	390
40 < x ≤ 50	250

[ Standard Deviation =13.37]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 20	210
20 < x ≤ 30	210
30 < x ≤ 40	195
40 < x ≤ 50	150

[ mean =25.06]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	150
20 < x ≤ 30	195
30 < x ≤ 40	225
40 < x ≤ 60	120

[ var =172.9]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 30	150
30 < x ≤ 40	345
40 < x ≤ 60	270
60 < x ≤ 70	180

[ Standard Deviation =18.09]