Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 20	240
20 < x ≤ 30	180
30 < x ≤ 40	390
40 < x ≤ 50	110

[ mean =27.21]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 20	300
20 < x ≤ 30	285
30 < x ≤ 50	240
50 < x ≤ 70	300

[ var =337.3]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 30	160
30 < x ≤ 50	360
50 < x ≤ 70	180
70 < x ≤ 90	290

[ Standard Deviation =24.76]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	105
10 < x ≤ 30	200
30 < x ≤ 40	420
40 < x ≤ 60	180
60 < x ≤ 70	250

[ mean =38.51]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 30	260
30 < x ≤ 40	420
40 < x ≤ 60	360
60 < x ≤ 70	190

[ var =275.3]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	230
30 < x ≤ 50	255
50 < x ≤ 70	330
70 < x ≤ 90	160

[ Standard Deviation =22.80]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 30	200
30 < x ≤ 50	315
50 < x ≤ 60	345
60 < x ≤ 70	300

[ mean =42.76]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	290
30 < x ≤ 40	240
40 < x ≤ 60	285
60 < x ≤ 80	180

[ var =361.4]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	135
10 < x ≤ 20	110
20 < x ≤ 30	180
30 < x ≤ 40	315
40 < x ≤ 60	100

[ Standard Deviation =13.58]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	190
30 < x ≤ 40	390
40 < x ≤ 50	345
50 < x ≤ 70	120

[ mean =36.07]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 30	170
30 < x ≤ 40	300
40 < x ≤ 50	270
50 < x ≤ 70	240

[ var =288.5]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 20	120
20 < x ≤ 30	225
30 < x ≤ 40	420
40 < x ≤ 60	290

[ Standard Deviation =12.69]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	170
30 < x ≤ 40	300
40 < x ≤ 50	285
50 < x ≤ 60	270

[ mean =37.99]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	300
30 < x ≤ 50	165
50 < x ≤ 70	315
70 < x ≤ 90	280

[ var =609.1]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 20	230
20 < x ≤ 30	150
30 < x ≤ 50	450
50 < x ≤ 60	170

[ Standard Deviation =15.86]