Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 30	280
30 < x ≤ 40	225
40 < x ≤ 50	360
50 < x ≤ 60	120

[ mean =33.63]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 20	290
20 < x ≤ 30	435
30 < x ≤ 50	345
50 < x ≤ 60	200

[ var =224.2]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 30	300
30 < x ≤ 50	375
50 < x ≤ 70	390
70 < x ≤ 80	230

[ Standard Deviation =20.92]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 20	160
20 < x ≤ 40	255
40 < x ≤ 60	300
60 < x ≤ 80	170

[ mean =36.73]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 20	270
20 < x ≤ 30	375
30 < x ≤ 50	360
50 < x ≤ 70	160

[ var =230.6]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	200
20 < x ≤ 40	240
40 < x ≤ 60	240
60 < x ≤ 70	150

[ Standard Deviation =20.34]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	170
20 < x ≤ 40	315
40 < x ≤ 50	180
50 < x ≤ 60	230

[ mean =34.45]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 30	110
30 < x ≤ 50	270
50 < x ≤ 70	330
70 < x ≤ 80	160

[ var =483.9]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	135
10 < x ≤ 20	210
20 < x ≤ 40	300
40 < x ≤ 50	225
50 < x ≤ 70	140

[ Standard Deviation =17.44]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	105
10 < x ≤ 30	130
30 < x ≤ 50	300
50 < x ≤ 70	390
70 < x ≤ 90	150

[ mean =47.00]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 20	220
20 < x ≤ 40	390
40 < x ≤ 50	330
50 < x ≤ 60	160

[ var =238.1]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	135
10 < x ≤ 30	230
30 < x ≤ 40	405
40 < x ≤ 50	375
50 < x ≤ 60	180

[ Standard Deviation =14.61]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 20	260
20 < x ≤ 30	210
30 < x ≤ 40	270
40 < x ≤ 60	230

[ mean =28.71]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	140
30 < x ≤ 40	450
40 < x ≤ 50	165
50 < x ≤ 70	220

[ var =269.5]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	85
10 < x ≤ 30	220
30 < x ≤ 50	315
50 < x ≤ 70	240
70 < x ≤ 80	280

[ Standard Deviation =22.66]