Mathematics, 04.02.2021 01:40 glogaming16

3 Questions - 1: A set of math tests is normally distributed with a mean of 81 and a standard deviation of 5. If Adam’s z-score was -0.6 and Leah’s z-score was 2.2, how many points higher did Leah score than Adam?

2: The number of homes sold each year by a realtor is normally distributed with a mean of 54. If the realtor sold 36 homes last year with a z-score of -2.4, what is the standard deviation?

3: The 400-meter race times recorded in the boys track meet was normally distributed with a standard deviation of 3 seconds. If David finished the race in 51.2 seconds with a z-score of -2.6, what was the mean time?

Answers: 1

Show answers

Another question on Mathematics

Mathematics, 21.06.2019 14:00

What are the critical values that correspond to a 95% confidence level and a sample size of 93? a. 65.647, 118.136 b. 59.196, 128.299 c. 57.143, 106.629 d. 69.196, 113.145

Answers: 3

Answer

Mathematics, 21.06.2019 15:30

In the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? segment ad bisects angle cab. triangle acd is similar to triangle abd. segment ad is congruent to segment ac. angle cab is congruent to angle cba.

Answers: 2

Answer

Mathematics, 21.06.2019 17:20

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Answers: 3

Answer

Mathematics, 21.06.2019 18:00

Find the multiplicative inverse of 8-12i

Answers: 2

Answer

You know the right answer?

3 Questions - 1: A set of math tests is normally distributed with a mean of 81 and a standard devia...

Questions

Mathematics, 15.05.2021 14:00

Find the expected value of the winnings from a game that has the following payout probability distribution: