Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 20	160
20 < x ≤ 30	255
30 < x ≤ 50	405
50 < x ≤ 70	130

[ mean =31.69]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	180
30 < x ≤ 50	150
50 < x ≤ 60	270
60 < x ≤ 80	170

[ var =408.7]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 30	160
30 < x ≤ 50	240
50 < x ≤ 60	270
60 < x ≤ 70	120

[ Standard Deviation =19.40]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	150
10 < x ≤ 30	270
30 < x ≤ 40	345
40 < x ≤ 60	390
60 < x ≤ 70	140

[ mean =36.16]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 30	170
30 < x ≤ 40	180
40 < x ≤ 50	225
50 < x ≤ 70	250

[ var =352.2]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 20	180
20 < x ≤ 40	390
40 < x ≤ 60	375
60 < x ≤ 70	130

[ Standard Deviation =17.95]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 20	100
20 < x ≤ 30	435
30 < x ≤ 40	330
40 < x ≤ 60	130

[ mean =28.46]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 20	280
20 < x ≤ 40	435
40 < x ≤ 50	405
50 < x ≤ 70	180

[ var =262.7]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 30	200
30 < x ≤ 40	450
40 < x ≤ 60	240
60 < x ≤ 80	230

[ Standard Deviation =19.26]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	100
30 < x ≤ 40	435
40 < x ≤ 60	210
60 < x ≤ 70	200

[ mean =40.47]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 20	100
20 < x ≤ 40	300
40 < x ≤ 60	225
60 < x ≤ 70	120

[ var =356.8]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	85
10 < x ≤ 20	130
20 < x ≤ 40	315
40 < x ≤ 60	435
60 < x ≤ 80	270

[ Standard Deviation =20.03]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	250
20 < x ≤ 30	195
30 < x ≤ 40	330
40 < x ≤ 50	170

[ mean =27.87]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	130
10 < x ≤ 30	180
30 < x ≤ 40	315
40 < x ≤ 60	450
60 < x ≤ 80	120

[ var =326.3]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 20	180
20 < x ≤ 30	150
30 < x ≤ 50	300
50 < x ≤ 60	170

[ Standard Deviation =16.22]