Mathematics, 15.04.2020 17:34, kbuhvu

A particular telephone number is used to receive both voice calls and fax messages. Suppose that 25% of the incoming calls involve fax messages, and consider a sample of 20 incoming calls.

(a) What is the expected number of calls among the 20 that involve a fax message? E(X)-5

(b) What is the standard deviation of the number among the 20 calls that involve a fax message? (Round your answer to three decimal places.) Ox= 1.936

(c) What is the probability that the number of calls among the 20 that involve a fax transmission exceeds the expected number by more than 2 standard deviations? (Round your answer to three decimal places.)

Answers: 2

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 18:00, BluSeaa

Arecipe calls for 2 2/4 cups of raisins, but julie only has a 1/4 measuring cup. how many 1/4 cups is needed to measure out 2 2/4 cups of raisins?

Answers: 1

continue

Mathematics, 21.06.2019 23:20, jessicasbss6840

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g

Answers: 1

continue

Mathematics, 22.06.2019 01:30, sliverx201

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

Answers: 1

continue

Mathematics, 22.06.2019 03:30, hajoshh

Atown recently dismissed 5 employees in order to meet their new budget reductions. the town had 5 employees over 50 years of age and 19 under 50. if the dismissed employees were selected at random, what is the probability that exactly 2 employees were over 50? express your answer as a fraction or a decimal number rounded to four decimal places.

Answers: 1

continue

Do you know the correct answer?

A particular telephone number is used to receive both voice calls and fax messages. Suppose that 25%...