+0  
 
+1
338
3
avatar+83 

For a certain group of students, the probability of randomly selecting a student who takes an art class is 41%, the probability of randomly selecting a student who takes a music class is 29%, and the probability of randomly selecting a student who takes both an art and a music class is 18%.

What is the probability of randomly selecting a student who takes an art or music class?

(Answer as a percentage please)

 

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An experiment involves selecting a numbered chip, some black and some white, from a bag of chips. The probability of selecting a black chip with an odd number is 14 . The probability of selecting a black chip is 23

.

What is the probability of selecting a chip with an odd number given that the chip is black?

(Answer as a simplified fraction please)

 

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A spinner is divided into five equal sections labeled 1, 2, 3, 4, and 5. Another spinner is divided into two equal sections labeled A and B. Nigel will spin each spinner one time.

How many of the possible outcomes have a number less than 3 or an A?

RedBlue  Dec 21, 2017
edited by RedBlue  Dec 21, 2017
 #1
avatar+119 
0

for the top one

 

 

 

 

70% is most likley

penquino21  Dec 21, 2017
 #2
avatar+86888 
+1

An experiment involves selecting a numbered chip, some black and some white, from a bag of chips. The probability of selecting a black chip with an odd number is 1/4 . The probability of selecting a black chip is 2/3

.

What is the probability of selecting a chip with an odd number given that the chip is black?

(Answer as a simplified fraction please)

 

 

Let P(Black)  =  2/3

Let P(Black and Odd)  = 1/4

And  we are trying to find P( Black and Odd I Black)

 

So....

 

P( Black and Odd I  Black)  =  P( Black and Odd)  / P(Black)  = 

(1/4)  / (2/3)  = 

(1/4) * (3/2)   =

3/8

 

 

 

 

cool cool cool

CPhill  Dec 21, 2017
 #3
avatar+86888 
+1

A spinner is divided into five equal sections labeled 1, 2, 3, 4, and 5. Another spinner is divided into two equal sections labeled A and B. Nigel will spin each spinner one time.

How many of the possible outcomes have a number less than 3 or an A?

 

We have 10  possible outcomes   =  Number Outcomes  * Letter Outcomes  =  5 * 2  = 10

 

So.....the ones we are interested in are

 

Outcomes < 3   =  2

Outcomes  = A  =  5

 

So.......outcomes < 3 or outcomes  = A     =  2  +  5    =   7  

 

 

cool cool cool

CPhill  Dec 21, 2017

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