x 4 5 6 7 8
P(X = x) 0.3 0.2 0.2 0.1 0.2


Step 1 of 5:

Find the expected value E(X)E(X). Round your answer to one decimal place.



Step 2 of 5:

Find the variance. Round your answer to one decimal place.



Step 3 of 5:

Find the standard deviation. Round your answer to one decimal place.

Step 4 of 5:



Find the value of P(X<8)P(X<8). Round your answer to one decimal place.

Step 5 of 5:

Find the value of P(X>5)P(X>5). Round your answer to one decimal place.