Btec: Assignment 2 prep

## Difficult

Q1) Calculate the Mean, Variance and Standard Deviation from

_x_| Frequency
10 | 100
11 | 105
12 | 85
13 | 90
14 | 55

Q1) Calculate the Mean, Variance and Standard Deviation from

_____x_____| Frequency
00 < x ≤ 10 | 100
10 < x ≤ 20 | 140
20 < x ≤ 40 | 225
40 < x ≤ 60 | 285
60 < x ≤ 70 | 160

Q1) (17 + 3i) / (2 -7i) =
Q2) Calculate the Mean, Variance and Standard Deviation from

_x_| Frequency
06 | 85
07 | 80
08 | 130
09 | 130
10 | 75

Q2) Calculate the Mean, Variance and Standard Deviation from

_____x_____| Frequency
00 < x ≤ 10 | 90
10 < x ≤ 20 | 240
20 < x ≤ 40 | 150
40 < x ≤ 50 | 345
50 < x ≤ 60 | 130

Q2) z1= 85 ∠ 45 °, z2 =15 ∠ -65 °. Calculate z1z2.
Q3) Calculate the Mean, Variance and Standard Deviation from

_x_| Frequency
05 | 105
06 | 145
07 | 85
08 | 75
09 | 85

Q3) Calculate the Mean, Variance and Standard Deviation from

_____x_____| Frequency
00 < x ≤ 10 | 55
10 < x ≤ 30 | 220
30 < x ≤ 50 | 225
50 < x ≤ 70 | 375
70 < x ≤ 90 | 120

Q3) z1= 55 ∠ 60 °, z2 =80 ∠ 20 °. Calculate z1z2.
Q4) Calculate the Mean, Variance and Standard Deviation from

_x_| Frequency
10 | 55
11 | 75
12 | 80
13 | 75
14 | 55

Q4) Calculate the Mean, Variance and Standard Deviation from

_____x_____| Frequency
00 < x ≤ 10 | 100
10 < x ≤ 30 | 190
30 < x ≤ 40 | 195
40 < x ≤ 50 | 450
50 < x ≤ 70 | 140

Q4) (14 + 6i) / (15 -2i) =
Q5) Calculate the Mean, Variance and Standard Deviation from

_x_| Frequency
08 | 95
09 | 80
10 | 110
11 | 60
12 | 125

Q5) Calculate the Mean, Variance and Standard Deviation from

_____x_____| Frequency
00 < x ≤ 10 | 75
10 < x ≤ 20 | 120
20 < x ≤ 30 | 405
30 < x ≤ 40 | 195
40 < x ≤ 60 | 220

Q5) z1= 60 ∠ 85 °, z2 =55 ∠ 50 °. Calculate z1z2.