Probability 81964

Calculate the probability of the event that you sit in seats 1 to 30 in the cinema at:
a) seat marked with a prime number
b) seat marked with an even number
c) a seat marked with a number divisible by 3 or 4

Correct answer:

p1 =  0.3333
p2 =  0.5
p3 =  0.5

Step-by-step explanation:

n=30  p:  2, 3, 5, 7, 11, 13, 17, 19, 23, 29  p1=n10=3010=31=0.3333
p2=nn/2=3030/2=21=0.5
12 24 n3=n/3+n/42=30/3+30/42=16 d3:3 6 9 12 15 18 21 24 27 30 d4:4 8 12 16 20 24 28  p3=n172=30172=21=0.5



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