I need help Negehejrvrkrvrnrbr

Mathematics

1 answer:

Luba_88 [7]2 years ago

3 0

V=4/3pi(5)
523.6 units cubed

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a student earned a grade of 80% on a math test that had 25 problems. how many problems on this test did the student answer corre

Mamont248 [21]

80% of 25
percent means parts out of 100
'of' means multiply
80% of 25 means
80/100 times 25=40/50 times 25=20/25 times 25=20

answer is 20 problems

6 0

2 years ago

Read 2 more answers

You are to take a multiple-choice exam consisting of 64 questions with 5 possible responses to each question. Suppose that you h

damaskus [11]

Answer:

a) Expected score on the exam is 12.8.

b) Variance 10.24, Standard deviation 3.2

Step-by-step explanation:

For each question, there are only two possible outcomes. Either you guesses the answer correctly, or you does not. The probability of guessing the answer of a question correctly is independent of other questions. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

$E(X) = np$