Year 8 Maths
Probability
Probability Problems
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Questions
Question 1
14941
A man selected a random number from 1 to 20 inclusive. Find the probability that the number is:
a) prime
b) a multiple of 2 or 7
c) a not a factor of 15
Part a:
\(\dfrac{3}{10}\)
\(\dfrac{2}{5}\)
Correct
\(\dfrac{1}{2}\)
\(\dfrac{1}{5}\)
Part b:
\(\dfrac{9}{20}\)
\(\dfrac{1}{2}\)
\(\dfrac{11}{20}\)
Correct
\(\dfrac{3}{5}\)
Part c:
\(\dfrac{1}{5}\)
\(\dfrac{3}{4}\)
\(\dfrac{3}{5}\)
\(\dfrac{4}{5}\)
Correct
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