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TA: Zhen (Alan) Zhang [email protected] 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. - PowerPoint PPT Presentation
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STT 200 – LECTURE 1, SECTION 2,4RECITATION 9(10/30/2012)
TA: Zhen (Alan) Zhang
[email protected] 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
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
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
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?
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?
Chapter 15 (Page 405): #16:
Paly cards: There are play cards in total.
From top to bottom: Clubs, Spades, Hearts, Diamonds.
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
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
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
Thank you.
