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3 years ago

Solve -5sqrtx = -15. A. x = -9 B. x = 7 C. x = 9 D. x = -7

Mathematics

2 answers:

evablogger [386]3 years ago

7 0

Answer:

C. x = 9.

Step-by-step explanation:

Solve -5 sqrtx = -15

Divide both sides by -5:

sqrt x = 3

Square both sides:

x = 9.

labwork [276]3 years ago

3 0

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Answer:

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Step-by-step explanation:

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3 years ago

The random variable X~(30,2^2) Find p(X<33) Find p(X>26)

Ostrovityanka [42]

Answer:

i) P(X<33) = 0.9232

ii) P(X>26) = 0.001

Step-by-step explanation:

Step(i):-

Given that the mean of the Population = 30

Given that the standard deviation of the Population = 4

Let 'X' be the Normal distribution

Step(ii):-

Given that the random variable X = 33

$Z = \frac{x-mean}{S.D}$

$Z = \frac{33-30}{2} = 1.5$ >0

P(X<33) = P( Z<1.5)

= 1- P(Z>1.5)

= 1 - ( 0.5 - A(1.5))

= 0.5 + 0.4232

P(X<33) = 0.9232

Step(iii) :-

Given that the random variable X = 26

$Z = \frac{x-mean}{S.D}$

$Z = \frac{33-26}{2} = 3.5$ >0

P(X>26) = P( Z>3.5)

= 0.5 - A(3.5)

= 0.5 - 0.4990

= 0.001

P(X>26) = 0.001

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3 years ago