Josie rode her bike 18 miles at 12 and then rode another 24 miles at 15.

how long did she ride in all?

a.27 hours

b.15 hours

c.6 hours

d.3.1 hours

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?