For each part, find how many numbers have the stated characteristic, then divide by 21.
e.g. multiples of 5:
these would be 10, 15, 20, 25, and 30
so prob(a multiple of 5 ) = 5/21
Do the others the same way
a number is chosen at random from the interger 10 to 30 inclusive what is the probability that it is a multiple of 3, a multiple of 5, prime number , perfect square
4 answers
A number is chosen at random from the integers 10 to 30 inclusive.find the probability that number is prime
Answer
Okay