Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	250
30 < x ≤ 50	300
50 < x ≤ 70	315
70 < x ≤ 80	260

[ mean =46.65]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	290
30 < x ≤ 40	300
40 < x ≤ 50	330
50 < x ≤ 60	130

[ var =220.1]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 20	220
20 < x ≤ 30	195
30 < x ≤ 50	225
50 < x ≤ 70	300

[ Standard Deviation =18.67]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 30	190
30 < x ≤ 50	150
50 < x ≤ 60	240
60 < x ≤ 70	290

[ mean =43.66]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	200
30 < x ≤ 50	210
50 < x ≤ 60	195
60 < x ≤ 80	100

[ var =386.2]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 30	240
30 < x ≤ 50	300
50 < x ≤ 60	255
60 < x ≤ 80	130

[ Standard Deviation =18.79]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 20	290
20 < x ≤ 30	450
30 < x ≤ 50	360
50 < x ≤ 70	200

[ mean =30.91]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 20	150
20 < x ≤ 30	240
30 < x ≤ 50	210
50 < x ≤ 70	250

[ var =338.2]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 30	270
30 < x ≤ 40	225
40 < x ≤ 60	450
60 < x ≤ 70	300

[ Standard Deviation =17.74]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	290
30 < x ≤ 50	315
50 < x ≤ 70	420
70 < x ≤ 80	240

[ mean =46.40]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 30	160
30 < x ≤ 50	300
50 < x ≤ 70	375
70 < x ≤ 90	190

[ var =555.7]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 20	200
20 < x ≤ 40	285
40 < x ≤ 60	405
60 < x ≤ 70	210

[ Standard Deviation =18.81]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 20	180
20 < x ≤ 30	435
30 < x ≤ 50	315
50 < x ≤ 60	280

[ mean =31.31]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 30	150
30 < x ≤ 40	300
40 < x ≤ 50	300
50 < x ≤ 60	270

[ var =253.9]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 20	130
20 < x ≤ 40	180
40 < x ≤ 50	375
50 < x ≤ 60	210

[ Standard Deviation =15.04]