Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 20	300
20 < x ≤ 30	150
30 < x ≤ 50	150
50 < x ≤ 70	130

[ mean =26.15]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	130
10 < x ≤ 20	220
20 < x ≤ 40	165
40 < x ≤ 50	435
50 < x ≤ 60	190

[ var =287.5]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 20	290
20 < x ≤ 30	330
30 < x ≤ 50	240
50 < x ≤ 70	290

[ Standard Deviation =18.55]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 20	110
20 < x ≤ 30	375
30 < x ≤ 50	420
50 < x ≤ 60	270

[ mean =34.32]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	150
10 < x ≤ 20	150
20 < x ≤ 40	240
40 < x ≤ 60	330
60 < x ≤ 70	280

[ var =442.1]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	85
10 < x ≤ 20	260
20 < x ≤ 30	330
30 < x ≤ 50	435
50 < x ≤ 60	210

[ Standard Deviation =14.87]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	160
30 < x ≤ 40	195
40 < x ≤ 50	150
50 < x ≤ 70	140

[ mean =36.36]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 30	230
30 < x ≤ 40	195
40 < x ≤ 60	270
60 < x ≤ 80	270

[ var =465.0]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	210
20 < x ≤ 40	390
40 < x ≤ 60	150
60 < x ≤ 80	180

[ Standard Deviation =21.02]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	130
10 < x ≤ 20	250
20 < x ≤ 40	150
40 < x ≤ 60	300
60 < x ≤ 80	130

[ mean =34.38]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 30	110
30 < x ≤ 40	390
40 < x ≤ 60	210
60 < x ≤ 80	280

[ var =364.8]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 30	290
30 < x ≤ 50	255
50 < x ≤ 60	285
60 < x ≤ 70	250

[ Standard Deviation =20.07]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	300
30 < x ≤ 40	255
40 < x ≤ 60	240
60 < x ≤ 80	290

[ mean =40.88]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 30	180
30 < x ≤ 40	255
40 < x ≤ 60	240
60 < x ≤ 80	250

[ var =449.3]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 20	190
20 < x ≤ 40	300
40 < x ≤ 50	315
50 < x ≤ 60	190

[ Standard Deviation =15.24]