A jar contains only pennies, nickels, dimes, and quarters. There are 11 pennies, 23 dimes, and 14 quarters. The rest of the coins are nickels. There are 72 coins in all. How many of the coins are not nickels? If n represents the number of nickels in the jar, what equation could you use to find n?

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample