Exercise 3 Page 827

When calculating probability, we are comparing the number of favorable outcomes to the number of possible outcomes. To calculate the probability that a randomly chosen number is prime, we will use the Probability Formula. Remember that 1 is not a prime number. P=Favorable Outcomes/Possible OutcomesOn the spinner, there are 4 prime and 4 non-prime numbers. The sum of these is the number of possible outcomes. 4+4= 8 possible outcomes Out of these, 4 are prime, which is the number of favorable outcomes. Now we have enough information to calculate P(a prime number).

P=Favorable Outcomes/Possible Outcomes

SubstituteValues

Substitute values

P(a prime number)=4/8

ReduceFrac

a/b=.a /4./.b /4.

P(a prime number)=1/2

The probability of choosing a prime number is 48 or 12.