An investment firm offers types of equity investment, A,B, and C. Of the firm's clients,30% invest in A,50% invest in B, and 20% invest in. C. The rates of return are 10%,6%,and 7%for A, B,and C, respectively. What is the expected value of the total return rate for the firm's clients? A: 6.2%
B: 7.1%
C:7.4%
D:8.2%

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

Find the ratios of the corresponding sides

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?