Question

a number is chosen at random from 1 to 20 . find the probabilty of slecting 1 number

(a) multiple of 4

(b) a prime nber
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Answer 1

Step-by-step explanation:

(a)   Total number of cases = 20

multiples of 4 between 1 to 20 :

4, 8, 12, 16, 20

Favourable cases =5

probabilities of choosen multiple of 4

5/20=1/4

(b)  Total number of cases = 20

Prime number 1 to 20

2,3,5,7,11,13,17,19

Favourable cases =8

probabilities of choosen prime numbers

8/20=2/5

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