Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 20	200
20 < x ≤ 30	195
30 < x ≤ 40	240
40 < x ≤ 50	100

[ mean =25.60]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	105
10 < x ≤ 30	190
30 < x ≤ 50	330
50 < x ≤ 60	210
60 < x ≤ 70	150

[ var =350.5]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	85
10 < x ≤ 20	250
20 < x ≤ 40	195
40 < x ≤ 60	375
60 < x ≤ 70	170

[ Standard Deviation =19.63]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 20	280
20 < x ≤ 40	420
40 < x ≤ 50	390
50 < x ≤ 60	250

[ mean =34.78]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 30	250
30 < x ≤ 50	270
50 < x ≤ 70	390
70 < x ≤ 90	250

[ var =558.4]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	100
20 < x ≤ 40	360
40 < x ≤ 60	450
60 < x ≤ 80	210

[ Standard Deviation =18.54]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 20	110
20 < x ≤ 30	195
30 < x ≤ 50	375
50 < x ≤ 60	270

[ mean =34.42]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	60
10 < x ≤ 20	210
20 < x ≤ 30	345
30 < x ≤ 50	390
50 < x ≤ 70	180

[ var =242.3]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	110
10 < x ≤ 30	100
30 < x ≤ 50	330
50 < x ≤ 70	315
70 < x ≤ 90	180

[ Standard Deviation =22.68]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 30	290
30 < x ≤ 40	255
40 < x ≤ 50	210
50 < x ≤ 70	120

[ mean =32.14]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	65
10 < x ≤ 20	130
20 < x ≤ 40	330
40 < x ≤ 60	330
60 < x ≤ 80	280

[ var =415.5]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 30	160
30 < x ≤ 40	315
40 < x ≤ 50	405
50 < x ≤ 60	240

[ Standard Deviation =14.97]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 30	110
30 < x ≤ 40	165
40 < x ≤ 50	165
50 < x ≤ 70	240

[ mean =37.00]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	240
30 < x ≤ 40	180
40 < x ≤ 60	450
60 < x ≤ 80	170

[ var =353.1]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 20	210
20 < x ≤ 40	300
40 < x ≤ 60	315
60 < x ≤ 70	230

[ Standard Deviation =19.39]