Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 30	230
30 < x ≤ 40	375
40 < x ≤ 50	330
50 < x ≤ 60	160

[ mean =36.35]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 30	170
30 < x ≤ 40	450
40 < x ≤ 50	210
50 < x ≤ 70	140

[ var =247.3]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 30	150
30 < x ≤ 40	270
40 < x ≤ 60	150
60 < x ≤ 70	180

[ Standard Deviation =19.18]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	210
30 < x ≤ 50	255
50 < x ≤ 60	420
60 < x ≤ 70	290

[ mean =45.54]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	300
30 < x ≤ 40	270
40 < x ≤ 50	270
50 < x ≤ 70	190

[ var =256.7]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 20	160
20 < x ≤ 30	240
30 < x ≤ 50	360
50 < x ≤ 70	290

[ Standard Deviation =17.41]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 20	250
20 < x ≤ 30	405
30 < x ≤ 40	240
40 < x ≤ 60	100

[ mean =25.37]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	120
30 < x ≤ 50	300
50 < x ≤ 70	300
70 < x ≤ 90	250

[ var =513.7]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 20	180
20 < x ≤ 30	450
30 < x ≤ 50	450
50 < x ≤ 60	150

[ Standard Deviation =14.02]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 30	120
30 < x ≤ 50	210
50 < x ≤ 70	210
70 < x ≤ 80	190

[ mean =45.00]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 30	200
30 < x ≤ 40	450
40 < x ≤ 50	300
50 < x ≤ 60	190

[ var =168.1]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	200
30 < x ≤ 50	375
50 < x ≤ 70	150
70 < x ≤ 80	230

[ Standard Deviation =22.94]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 30	190
30 < x ≤ 40	360
40 < x ≤ 50	375
50 < x ≤ 70	100

[ mean =35.63]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	160
30 < x ≤ 40	390
40 < x ≤ 60	435
60 < x ≤ 70	280

[ var =318.7]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 20	190
20 < x ≤ 30	225
30 < x ≤ 40	255
40 < x ≤ 50	260

[ Standard Deviation =13.34]