"ces If X is a normal random variable with mean 10, and if the probability that X is more than 9.54 is 5910 (as shown below), then what is the standard deviation of
X? (Note: the diagram is not necessarily to scale)
A
OA 2.00
OB. 1.00
O C. 1.33
OD. 0.50

step-by-step explanation:

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second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

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step-by-step explanation:

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step-by-step explanation:

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