Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	300
20 < x ≤ 40	405
40 < x ≤ 50	270
50 < x ≤ 60	130

[ mean =31.00]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	110
20 < x ≤ 30	390
30 < x ≤ 40	420
40 < x ≤ 50	150

[ var =133.8]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 20	210
20 < x ≤ 40	180
40 < x ≤ 60	240
60 < x ≤ 70	200

[ Standard Deviation =20.15]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	85
10 < x ≤ 30	110
30 < x ≤ 40	165
40 < x ≤ 60	330
60 < x ≤ 80	290

[ mean =46.12]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	280
30 < x ≤ 40	285
40 < x ≤ 60	345
60 < x ≤ 80	180

[ var =381.4]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 20	200
20 < x ≤ 30	390
30 < x ≤ 50	225
50 < x ≤ 70	250

[ Standard Deviation =17.73]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 20	130
20 < x ≤ 40	405
40 < x ≤ 60	240
60 < x ≤ 70	290

[ mean =38.30]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 30	120
30 < x ≤ 50	420
50 < x ≤ 60	210
60 < x ≤ 70	190

[ var =293.3]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 20	130
20 < x ≤ 40	390
40 < x ≤ 50	450
50 < x ≤ 60	160

[ Standard Deviation =13.70]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	135
10 < x ≤ 20	210
20 < x ≤ 40	435
40 < x ≤ 50	435
50 < x ≤ 60	160

[ mean =32.91]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	280
30 < x ≤ 50	240
50 < x ≤ 60	150
60 < x ≤ 70	110

[ var =340.4]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	130
10 < x ≤ 30	160
30 < x ≤ 40	180
40 < x ≤ 60	240
60 < x ≤ 80	210

[ Standard Deviation =21.89]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	220
20 < x ≤ 30	315
30 < x ≤ 50	450
50 < x ≤ 70	240

[ mean =34.03]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	105
10 < x ≤ 20	230
20 < x ≤ 40	375
40 < x ≤ 60	345
60 < x ≤ 80	280

[ var =445.7]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	130
20 < x ≤ 30	450
30 < x ≤ 40	180
40 < x ≤ 60	250

[ Standard Deviation =14.19]