The number of potato chips in a bag is normally distributed with a mean of 74 and a standard deviation of 4. Approximately what percent of bags contain between 62 and 86 potato chips?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

Which expression will have the same sum as 3_8 + 1/4?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?