Ch 8 Review Stuff Formulas Wup for 1

Ch. 8 Review Stuff

Formulas: �

�W-up : for #1 -4 Use the tree to answer the following questions purple K white L purple 1. 2. 3. 4. P(W|K) P(Y|L) P(white) P(K|W) 5. Find the probability of throwing a sum of 10 in at least 3 times in 5 throws of a pair of dice? white yellow 6. Three Machines A 1, A 2, A 3, produce 55%, 30%, and 15% of total production. They produce 1%, 2%, and 3% defective output respectively. An item chosen at random is defective. What is the probability that it came from A 2?

� 7. Colleen bets $1 on a 2 -digit number. She wins $75 if she draws her number from the set of all 2 digit numbers {00, 01, 02, 03… 99}; otherwise she loses her $1. �A) is this game fair to the player? �B) how much is Colleen expected to lose in a game?

W-up: ch 9 1. Use calculator to find mean, population and sample standard deviation Class Frequency 7 -10 5 11 -14 11 15 -18 2 19 -22 7 SHOW STEPS – WORK!! For 2 -4 Given the sample data, 5, 9, 10, 11, 14 find 2. Mean 3. Standard deviation 4. Z-score for 9 5. Find the area between -. 75 and 1. 65 standard deviation 6. Find the area that exceeds 1. 85 standard deviations

� 7. the weight of 100 college students closely follows a normal distribution with a mean of 130 pounds and a standard deviation of 5. 2 pounds. �A) draw a normal bell curve to 3 standard deviations �B) how many students would you expect to weigh at least 142 pounds? �C) what range of weights would you expect to include the middle 70% of students in this group?

Ch 9 answers 1. 14. 26 4. 48 4. 39 2. 9. 8 3. 3. 27 (want sample standard deviation) 4. -0. 245 5. 0. 7239 6. . 0322 7. is # 17 on 9. 6

Ch 8: Rev: 1 -35 Odds are fair game!! 9. 5 – standard deviation by hand 1 -5 Standard deviation for grouped data using calculator 15 9. 6 normal distribution z-scores, how to read chart, one story prob 1114, 17