Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 20	130
20 < x ≤ 40	330
40 < x ≤ 60	345
60 < x ≤ 80	160

[ mean =38.47]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	300
30 < x ≤ 50	180
50 < x ≤ 70	210
70 < x ≤ 80	170

[ var =518.3]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 30	180
30 < x ≤ 40	225
40 < x ≤ 50	210
50 < x ≤ 60	120

[ Standard Deviation =15.39]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 30	230
30 < x ≤ 40	150
40 < x ≤ 50	165
50 < x ≤ 70	230

[ mean =36.45]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	50
10 < x ≤ 20	110
20 < x ≤ 30	315
30 < x ≤ 50	375
50 < x ≤ 60	120

[ var =176.3]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 20	100
20 < x ≤ 30	345
30 < x ≤ 40	345
40 < x ≤ 50	200

[ Standard Deviation =10.68]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 30	180
30 < x ≤ 50	195
50 < x ≤ 70	195
70 < x ≤ 80	150

[ mean =40.76]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 30	130
30 < x ≤ 40	165
40 < x ≤ 50	420
50 < x ≤ 70	200

[ var =255.4]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	145
10 < x ≤ 20	200
20 < x ≤ 30	270
30 < x ≤ 40	420
40 < x ≤ 50	100

[ Standard Deviation =11.82]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	100
10 < x ≤ 20	250
20 < x ≤ 30	180
30 < x ≤ 40	300
40 < x ≤ 60	250

[ mean =29.40]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 30	160
30 < x ≤ 40	195
40 < x ≤ 60	150
60 < x ≤ 70	200

[ var =422.2]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 20	180
20 < x ≤ 30	195
30 < x ≤ 40	270
40 < x ≤ 60	210

[ Standard Deviation =14.67]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	260
30 < x ≤ 40	180
40 < x ≤ 50	210
50 < x ≤ 70	220

[ mean =36.37]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 20	110
20 < x ≤ 30	195
30 < x ≤ 50	315
50 < x ≤ 60	140

[ var =262.0]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	130
10 < x ≤ 30	200
30 < x ≤ 40	180
40 < x ≤ 50	450
50 < x ≤ 60	120

[ Standard Deviation =15.37]