Each month Jean’s phone company charges her a flat fee of $10 and $0.25 for each minute. The chart below shows Jean's total bill for a different amount of minutes. Number of Minutes 30 40 52
Total Bill $17.50 $20.00 $23.00

Part A

Write an equation in the slope-intercept form showing how Jean's dad can find her total bill each month. Interpret what the slope and y-intercept mean in the context of this problem.

Equation: _
Slope: _
Y-intercept: __

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?