Acell phone company wants to determine the average amount of data that their smart phone customers use each month. which group would best represent a sample of the population? a. one thousand of their customers with the most expensive monthly plans b. one thousand of their customers who most recently signed up with the company c. one thousand of their customers with a current smart phone data plan d. one thousand of their customers who called in for technical support

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

What would the rule be for the reflection of y=-3

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?