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Some of the children at the nursery arrive by car.

 

40% of the children are boys

70% of the boys arrive by car

60% of the girls arrive by car

 

What is the probability that a child chosen at random from the nursery will arrive by car

Walthamx  Mar 30, 2018

Best Answer 

 #1
avatar
+1

Let us see if I can figure this one out!

 

Will assume that there are 100 kids.

100 x 40% =40 of them are boys

40 x 70% =  28 boys arrive by car.

100 - 40 = 60 - Number of girls in Nursery.

60 x 60% = 36 of them arrive by car.

28 boys + 36 girls = 64 - kids that arrive by car.

64 / 100 = 64% - probability of a randomly picked kid that he/she arrived by car.

Guest Mar 30, 2018
 #1
avatar
+1
Best Answer

Let us see if I can figure this one out!

 

Will assume that there are 100 kids.

100 x 40% =40 of them are boys

40 x 70% =  28 boys arrive by car.

100 - 40 = 60 - Number of girls in Nursery.

60 x 60% = 36 of them arrive by car.

28 boys + 36 girls = 64 - kids that arrive by car.

64 / 100 = 64% - probability of a randomly picked kid that he/she arrived by car.

Guest Mar 30, 2018

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