Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	105
10 < x ≤ 20	130
20 < x ≤ 30	330
30 < x ≤ 40	315
40 < x ≤ 50	230

[ mean =28.92]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 30	150
30 < x ≤ 40	300
40 < x ≤ 50	360
50 < x ≤ 60	120

[ var =169.6]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	210
30 < x ≤ 40	450
40 < x ≤ 60	315
60 < x ≤ 70	100

[ Standard Deviation =15.46]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 30	160
30 < x ≤ 40	150
40 < x ≤ 50	405
50 < x ≤ 60	140

[ mean =35.87]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 20	260
20 < x ≤ 30	390
30 < x ≤ 50	180
50 < x ≤ 60	270

[ var =261.4]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 30	120
30 < x ≤ 40	405
40 < x ≤ 50	405
50 < x ≤ 70	170

[ Standard Deviation =13.41]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 30	250
30 < x ≤ 50	390
50 < x ≤ 60	165
60 < x ≤ 70	150

[ mean =37.23]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 30	170
30 < x ≤ 50	420
50 < x ≤ 70	375
70 < x ≤ 80	220

[ var =470.2]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 30	150
30 < x ≤ 40	450
40 < x ≤ 50	390
50 < x ≤ 70	140

[ Standard Deviation =13.26]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	270
20 < x ≤ 40	405
40 < x ≤ 60	255
60 < x ≤ 80	250

[ mean =35.60]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 30	220
30 < x ≤ 40	240
40 < x ≤ 60	225
60 < x ≤ 70	160

[ var =349.6]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 20	230
20 < x ≤ 30	345
30 < x ≤ 40	345
40 < x ≤ 60	170

[ Standard Deviation =12.94]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	280
30 < x ≤ 50	450
50 < x ≤ 70	330
70 < x ≤ 80	200

[ mean =44.17]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 30	210
30 < x ≤ 50	195
50 < x ≤ 70	330
70 < x ≤ 80	130

[ var =463.8]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 20	120
20 < x ≤ 40	285
40 < x ≤ 50	255
50 < x ≤ 70	100

[ Standard Deviation =16.97]