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Chapter 5: R5.6 - Review Exercises (page 356)

Mike鈥檚 pizza - You work at Mike鈥檚 pizza shop. You have the following information about the 9 pizzas in the oven: 3 of the 9 have thick crust and 2 of the 3 thick-crust pizzas have mushrooms. Of the remaining 6 pizzas, 4 have mushrooms.

a. Are the events 鈥渢hick-crust pizza鈥 and 鈥減izza with mushrooms鈥 mutually exclusive? Page Number: 356 Justify your answer.

b. Are the events 鈥渢hick-crust pizza鈥 and 鈥減izza with mushrooms鈥 independent? Justify your answer.

c. Suppose you randomly select 2 of the pizzas in the oven. Find the probability that both have mushrooms.

Short Answer

Expert verified

(a) Events are not mutually exclusive .

(b) Events are not independent .

(c) Required probability is512.

Step by step solution

01

Part (a) - Step 1 : Given Information 

We are given that we have 9pizzas in the oven: 3of the 9have thick crust and 2of the 3thick-crust pizzas have mushrooms. Of the remaining 6pizzas , 4have mushrooms . We need to find if the events 鈥渢hick-crust pizza鈥 and 鈥減izza with mushrooms鈥 mutually exclusive .

02

Part (a) - Step 2 : Explanation

For events to be mutually exclusive when (AB)=0

The given events are not mutually exclusive because thick crust pizza have common things with mushroom . So the given events are not mutually exclusive .

03

Part (b) - Step 1 : Given Information 

We are given that we have 9pizzas in the oven: 3of the 9have thick crust and 2of the 3thick-crust pizzas have mushrooms. Of the remaining 6pizzas , 4 have mushrooms . We are required to find if the events 鈥渢hick-crust pizza鈥 and 鈥減izza with mushrooms鈥 independent .

04

Part (b) - Step 2 : Explanation 

Let A be thick crust and Let B= mushrooms

P(A/B) =P(A)

2347

P(B/A) = P(B)

1237

Since the probabilities are not equal, these events are not independent .
05

Part (c) - Step 1 : Given Information

We are given 9pizzas and we randomly select 2of the pizzas in the oven. We need to find the probability that both pizzas have mushroom .

06

Part (c) - Step 2 : Explanation

The required probability is P (first pizza to be mushroom one )P(second mushroom pizza)

Required probability =6958

=512

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