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STT 200 – Lecture 1, section 2,4 Recitation 9 ( 10/30/2012 )

TA: Zhen (Alan) Zhang zhangz19@stt.msu.edu Office hour: (C500 WH) 1:45 – 2:45PM Tuesday (office tel.: 432-3342) Help-room: (A102 WH) 11:20AM-12:30PM, Monday, Friday Class meet on Tuesday: 3:00 – 3:50PM A122 WH, Section 02 12:40 – 1:30PM A322 WH, Section 04.

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STT 200 – Lecture 1, section 2,4 Recitation 9 ( 10/30/2012 )

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  1. TA: Zhen (Alan) Zhang zhangz19@stt.msu.edu Office hour: (C500 WH) 1:45 – 2:45PM Tuesday (office tel.: 432-3342) Help-room: (A102 WH) 11:20AM-12:30PM, Monday, Friday Class meet on Tuesday: 3:00 – 3:50PM A122 WH, Section 02 12:40 – 1:30PM A322 WH, Section 04 STT 200 – Lecture 1, section 2,4Recitation 9(10/30/2012)

  2. Overview • We will discuss following problems: • Chapter 15 “Probability Rules” (Page 404) # 8, 13, 14, 16, 17, 18 • All recitation PowerPoint slides available at here

  3. Chapter 15 (Page 404): #8: Dogs: 24 (8 males); cats: 18 (6 males). An animal is selected randomly. Find the probability: • The pet is male, given it is a cat The total number of animals is 24 + 18 = 42 • The pet is cat, given it is female • The pet is female, given it is a dog

  4. Chapter 15 (Page 405): #13: 70% kids have a fever, 30% kids with fever have sore throats. What is the probability that a kid has a fever and a sore throats?

  5. Chapter 15 (Page 405): #14: 20% of cars have faulty pollution control systems. The cost of repairing exceeds $100 about 40% of the time. What is the probability that a driver ends up paying more than $100 to repair when doing car inspection?

  6. Chapter 15 (Page 405): #16: Paly cards: There are play cards in total. From top to bottom: Clubs, Spades, Hearts, Diamonds.

  7. Chapter 15 (Page 405): #16 Questions: Pick up 3 cards at random from a deck. Find the probability: • You get no aces • You get all hearts • The third card is your first red card • You have at least one diamond

  8. Chapter 15 (Page 405): #17: A junk box contains a dozen old batteries, with 5 totally dead. You start picking batteries one at a time and testing them. Find the probability: • The first two you choose are both good • At least one of the first three works • The first four you pick all work • You have to pick 5 batteries in order to find one that works

  9. Chapter 15 (Page 405): #18: Shirts size: medium (4), large (10), extra-large (6). You want a medium for two persons. Find the probability • The first two you grab are the wrong sizes • The first medium you find is the third one you check • The first four shirts you pick are all extra-large • At least one of the first four shirts you check is a medium

  10. Thank you.

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