Exercise 4 Page p36

To calculate the probability of picking a coin of the value greater than $\$0.10,$ we use the Probability Formula. The jar which we are choosing from contains $70$ nickels, $100$ dimes, $80$ quarters, and $50$ one-dollar coins. For the denominator of this formula, the total number of possible outcomes, we need the total number of coins. For the numerator of this formula, the total number of favorable outcomes, we need the total number of quarters and one-dollar coins, because their values are greater than $\$0.10.$ Now we have enough information to calculate $P(\text{value greater than }\$0.10).$ The probability of choosing a value greater than $\$0.10$ is $\frac{13}{30}.$