Robert has 20 pieces of candy in a bag: 7 mint sticks, 2 jelly treats, and 11 fruit tart chews. if he eats one piece every 2 minutes, what is the probability his first two pieces will both be mint sticks?

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Abag contains 3 red marbles, 2 blue marbles, and 2 green marbles. one marble is picked, then another marble. assume that the selections are made with replacement. a) find the probability of picking two red marbles with replacement. b) find the probability of picking a red marble and a blue marble. assume the selections are made without replacement. c) find the probability of picking two red marbles without replacement. d) find the probability of picking a red marble and a blue marble without replacement.