2RelativeResourceManager

- Review Problems for Test 2 Extra problems 1 The average time it takes to take test 1 is 25 minutes with a standard deviation of 12 minutes The

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Review Problems for Test 2 Extra problems 1. The average time it takes to take test 1 is 25 minutes with a standard deviation of 12 minutes. The time it takes to take test 1 is known to be normally distributed. a. Describe this distribution. X~N(25, 12)minutes b. What is the probability a randomly selected student will take less than 27 minutes to take test 1? i. What is the random variable? X= The average time it takes to take test 1 ii. Describe this distribution. X~N(25, 12)minutes iii. Can the probability be found? Yes iv. If the probability can be found, what is it? 27 25 ( 27) ( ) 12 ( 27) ( 0.17) ( 27) 0.5675 P X P Z P X P Z PX c. If a random sample of 9 students is selected, what is the probability that the mean time to take test 1 for these 9 students is less than 27 minutes? i. What is the random variable? mean time to take test 1 for these 9 students X ii. Describe this distribution. 12 (25, ) 9 XN iii. Can the probability be found? Yes iv. If the probability can be found, what is it?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/02/2011 for the course STAT 250 taught by Professor Sims during the Spring '08 term at George Mason.

Page1 / 3

- Review Problems for Test 2 Extra problems 1 The average time it takes to take test 1 is 25 minutes with a standard deviation of 12 minutes The

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online