The communication monitoring company Attivio has reported that 91% of e-mail messages are spam. Suppose your inbox contains 25 messages. Assume messages arrive independently and at random. a) What are the mean and standard deviation of the number of real messages you should expect to find in your inbox?
b) What’s the probability that you’ll find only 1 or 2 real messages?

stops on an even number.

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40