Question

1. There are 5 red , 7 blue and 6 green biros in a packet. What is probability of a boy picking a green or red biro closing his eyes ?

2. In a basket of fruits, there are 6 grapes , 11 bananas and 13 oranges. if one fruit is chosen at random , what is the probability that the fruit is either a grape or banana ?

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Answer 1

1.) P( green or red ) = 11 /18

2.) P ( grapes and bnaa ) = 17 / 30

Explanation:

1 .) Probability of boy picking a green or red bior closing his eyes

• = sum of red and green biros / Total no. of biros in a packet.

= 5 + 6 / 5 + 7 + 6

P( green or red ) = 11 /18

2.) Probability of that the fruit is either a grape and banana , P ( grapes and banana)

• = Sum of grapes and banana / total no. of fruits in basket.

P ( grapes and banana ) = 6 + 11 /6 +11 +13

P ( grapes and banana ) = 17 / 30

Answer 2

• It should be self-explanatory if you look at the numbers

#1

• P(green or red) = (5 + 6)/(5 + 7 + 6) = 11/18 or 61.11%

#2

• P(grape or banana) = (6 + 11)/(6 + 11 + 13) = 17/30 or 56.67%