Q1) Estimate the mean from

x	Frequency
00 < x ≤ 10	130
10 < x ≤ 30	250
30 < x ≤ 40	195
40 < x ≤ 60	315
60 < x ≤ 80	160

[ mean =37.55]

Q1) Calculate the variance from

x	Frequency
00 < x ≤ 10	75
10 < x ≤ 30	250
30 < x ≤ 40	165
40 < x ≤ 50	150
50 < x ≤ 60	160

[ var =250.8]

Q1) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 20	300
20 < x ≤ 30	210
30 < x ≤ 40	150
40 < x ≤ 60	260

[ Standard Deviation =15.25]

Q2) Estimate the mean from

x	Frequency
00 < x ≤ 10	140
10 < x ≤ 30	160
30 < x ≤ 40	255
40 < x ≤ 60	270
60 < x ≤ 70	240

[ mean =39.37]

Q2) Calculate the variance from

x	Frequency
00 < x ≤ 10	90
10 < x ≤ 30	290
30 < x ≤ 40	270
40 < x ≤ 50	330
50 < x ≤ 60	210

[ var =221.1]

Q2) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 30	140
30 < x ≤ 50	330
50 < x ≤ 60	270
60 < x ≤ 80	100

[ Standard Deviation =18.56]

Q3) Estimate the mean from

x	Frequency
00 < x ≤ 10	120
10 < x ≤ 20	280
20 < x ≤ 30	420
30 < x ≤ 40	150
40 < x ≤ 50	170

[ mean =24.74]

Q3) Calculate the variance from

x	Frequency
00 < x ≤ 10	115
10 < x ≤ 20	190
20 < x ≤ 40	285
40 < x ≤ 50	375
50 < x ≤ 70	280

[ var =317.8]

Q3) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	70
10 < x ≤ 30	160
30 < x ≤ 40	180
40 < x ≤ 60	315
60 < x ≤ 70	200

[ Standard Deviation =18.25]

Q4) Estimate the mean from

x	Frequency
00 < x ≤ 10	80
10 < x ≤ 30	140
30 < x ≤ 40	315
40 < x ≤ 50	315
50 < x ≤ 60	180

[ mean =37.18]

Q4) Calculate the variance from

x	Frequency
00 < x ≤ 10	150
10 < x ≤ 20	190
20 < x ≤ 40	420
40 < x ≤ 50	180
50 < x ≤ 60	250

[ var =276.1]

Q4) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	135
10 < x ≤ 30	200
30 < x ≤ 50	330
50 < x ≤ 60	285
60 < x ≤ 70	250

[ Standard Deviation =19.64]

Q5) Estimate the mean from

x	Frequency
00 < x ≤ 10	55
10 < x ≤ 30	150
30 < x ≤ 50	345
50 < x ≤ 70	330
70 < x ≤ 80	180

[ mean =47.52]

Q5) Calculate the variance from

x	Frequency
00 < x ≤ 10	95
10 < x ≤ 20	110
20 < x ≤ 40	450
40 < x ≤ 50	420
50 < x ≤ 60	300

[ var =215.7]

Q5) Calculate the Standard Deviation from

x	Frequency
00 < x ≤ 10	125
10 < x ≤ 20	250
20 < x ≤ 40	375
40 < x ≤ 60	300
60 < x ≤ 80	190

[ Standard Deviation =20.52]