Need help for this question pls urgent Here are the marks of a student in four exams.

65 80 76 69

The student takes a fifth exam.
His mean mark for the five exams is 70

Work out his mark in the fifth exam.

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Which table shows a proportional relationship between miles traveled and gas used?