Question

12 Ir the mean and SUOI
(c) ab
(b) 1
13. What is the coefficient of variation of the following nur
33, 32, 61, 60, 64
(a) 8.09
(b) 18.08
(c) 20.2
14. If the SD of x is 3, what us the variance of (5-2x)?
(ahjjhdhaioenjdkan) 36
(b) 6
(c) 1
15. If x and y are related by 2x+3y+4 = 0 and SD of x is 6
(a) 22
(b) 4
(c) ✓
and 65 respec​

Answer 1

Answer:

Hi Dear....here is your answer.....

given,

Zeroes are 1/2+2√3 and 1/2-2√3

sum of zeroes = 1/2+2√3 + 1/2-2√3

= 1/2 + 1/2

= 1

product of zeroes = 1/2+2√3 x 1/2-2√3

= [ 1/2 ] ² - [ 2√3 ]²

= 1/4 - 12

= 1/4 - 48 / 4

= -47 /4

Quadratic equation

x² - [ sum of zeroes ]x + product of zeroes

=x² - x + -47/4............

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Answer 2

Answer:

13. To find the mean of the above numbers,

x = 53+52+61+60+64 / 5 = 290/5 = 58

To find Standard deviation.,

S = √53² +52²+61²+60²+64² / 5  - (58²)

  =√16390/5 -3364   = √3386-3364

  =√22  = 4.69

To find Coefficient of variation,

Coefficient of variation ( C. V) = ( S / X ) * 100

                       = ( 4.69 /58 ) * 100  = 0.0809 * 100

                       ⇒8.09

14. 6

15. 2x + 3y + 4 = 0  

2x + 3y + 4 = 0  

2(6) + 3y + 4 = 0  

12 + 3y + 4 = 0  

3y = – 16  

y = – 16/3