If x is normally distributed with a mean of 20 and a standard deviation of 2, fi

Question

If x is normally distributed with a mean of 20 and a standard deviation of 2, find P(20 x 22.6).

a) 0.503

b) 0.603

c) 0.703

d) 0.403

e) 0.903

f) None of the above

Suppose that x is normally distributed with a mean of 20 and a standard deviation of 18. What is P(x 62.48)?

a) 0.012

b) 0.014

c) 0.491

d) 0.009

e) 0.991

f) None of the above

Suppose that x is normally distributed with a mean of 50 and a standard deviation of 10. What is P(x 74.50)?

a) 0.493

b) 0.995

c) 0.007

d) 0.993

e) 0.496

f) None of the above

Explanation / Answer

Solutions:

If x is normally distributed with a mean of 20 and a standard deviation of 2, find P(20 x 22.6).

the correct option is D-0.403

Suppose that x is normally distributed with a mean of 20 and a standard deviation of 18. What is P(x 62.48)?

the correct option is D-0.009

Suppose that x is normally distributed with a mean of 50 and a standard deviation of 10. What is P(x 74.50)?

the correct option is D-0.993

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