A bag contains cards numbered from 1 to 100. a card is drawn at random from the bag. find the probability that the
a.card bears a number which is greater than or equal to 80.
b.card bears a number which is a multiple of 5.
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Answered by
101
S={1,2,3,4,5,......,96,97,98,99,100}
n(S)=100
EVENT A
A={80,81,82,83,84,85,86,87,89,90,91,92,93,94,95,96,97,98,100}
n(A)=20
P(A)=n(A)÷n(S)=20÷100=2/10=1/5
EVENT B
B={5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100}
n(B)=20
P(B)=20÷100=1/5
n(S)=100
EVENT A
A={80,81,82,83,84,85,86,87,89,90,91,92,93,94,95,96,97,98,100}
n(A)=20
P(A)=n(A)÷n(S)=20÷100=2/10=1/5
EVENT B
B={5,10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100}
n(B)=20
P(B)=20÷100=1/5
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