random variable?/probability question
I normally can figure out these straightforward statistics problems, but this one has got me stumped! Thanks in advance to anybody who offers insight.
A summer resort rents rowboats to customers but does not allow more than four people to a boat. Each boat is designed to hold no more than 800 pounds. Suppose the distribution of adult males who rent boats, including their clothes and gear, is normal with a mean of 190 pounds and standard deviation 10 pounds. If the weights of individuals passengers are independent, what is the probability that a group of four adult males passengers will exceed the acceptable weight limit of 800 pounds?