Question

Sally's wallet contains:5 quarters3 dimes• 8 nickels• 4 penniesA coin is drawn from the purse and replaced 240 times. How many times can you predict that a nickle or apenny will be drawn?

Answer 1

The total number of coins in the wallet, is:

`5+3+8+4=20`

Since there are 8 nickels and 4 pennies, there are 12 coins which are either nickels or pennies. Then, the probability of picking a nicle or a penny, is:

`(12)/(20)=(3)/(5)`

Multiply 3/5 by 240 to find the expected amount of times that a nicke or penny will be drawn:

`(3)/(5)*240=144`