Zachary has a smart phone data plan that cost $40 per months that includes 10 GB of data, but will charge an extra $10 per GB over the included amount. How much would Zachary have to pay in a month where he used went over by x GB

$40 + 10x

Step-by-step explanation:

Given that:

Original cost of data plan = $40 per month for 10 GB of data

Additional data cost = $10 per GB when usage is above the original data cap

Hence, amount to be paid when usage is over the original data cap by x GB :

Original amount + (additional cost per GB * additional GB used)

$40 + ($10 * x)

$40 + 10x

probability for j is 1/4

while

a is 1/6