MATH 302 Week 3 Test | Score 20/20 | American Public University

Week 3 Test - Results X


Attempt 1 of 2

Written Sep 21, 2025 2:22 PM - Sep 21, 2025 3:01 PM




Attempt Score 20/ 20 - 100 %
Overall Grade (Highest Attempt) 20/ 20 - 100 %




Question 1 1/1 poinq

A coin is flipped 30 times. What is the probability of getting 15 or more
heads? Round answer to 4 decimal places. Answer: 5/22 v

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P(x > 15) =1 - P(x < 14) in Excel

=1-BINOM.DIST(14,30,0.5,TRUE)




Question 2 1/ 1 point

If random variable X has a binomial distribution with n=9 and P(success) =p=
0.4, find the standard deviation of X. (round to 4 decimal places) Answer:
1.4697 v

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in Excel,

=SQRT(9*0.4*0.6)




Question 3 1/ 1 point

Suppose a random variable, x, arises from a binomial experiment. If n = 25,
and p = 0.85, find the variance. Round answer to 4 decimal places. Answer:
31875 v

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25*.85*%.15




Question 4 1/ 1 point

It is known that 20% of adult workers have a high school diploma. If a random
sample of 10 adult workers is selected, what is the probability that 5 or more
of them have a high school diploma? (That is, find P(X = 5) (round to 4 decimal
places) Answer: .0328 v

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