Question

find the probability if selecting a composite number from all the multiples of 6 less than 60

Answer 1

Multiples of 6 less than 60 are:

6 , 12 , 18 , ...................................

Now composite number is a number which is divisible by another number other than 1 and itself

So here all multiples of 6 are composite numbers.

P( composite) = /Number of favourable outcomes/Number of possiblities

Outcome = 6, 12 ,18 ,24 ,30 ,36 ,42, 48, 54

Hence outcome = 9

P(composite) = 9 / 9==> 1

There are 9 possibilities

Probability is 1

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Answer 2

Given: Probability that it will rain P(E) = 0.85

TO FIND: Probability that it will not rain P(E)

CALCULATION: We know that sum of the probability of occurrence of an event and probability of non occurrence of an event is 1.

• $0.85 + P(\bar{E}) = 1 \:$
• $P(\bar{E}) = 1 - 0.85$

• $P(\bar{E}) = 0.15$

Hence the probability that it will not rain is = 0.15