Dida bought a scratch ticket for $2.00. The potential payoffs and probability of those payoffs are shown below. Value Probability
$0.00 0.15
$0.50 0.50
$1.00 0.20
$2.00 0.10
$10.00 0.05

What is the expected value for the scratch ticket that Dida bought?

$1.50

$1.15

$0.50

$2.00

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

What are the values of each variable in the diagram below?