1. There are 9 blue marbles in a box. How many groups of 4 marbles are
possible?
2. There are...
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Mathematics, 29.04.2021 09:10 ShelleyPSeliger
1. There are 9 blue marbles in a box. How many groups of 4 marbles are
possible?
2. There are 12 boys in a class. In how many ways can they group
themselves by 6?
3. How many group of 5 red cards can be drawn from a deck of 12 red
cards?
4. In how many ways can 8 students seat in arrow of 5. chairs?
5. How many letters of the word GRACIOUS both begin and end with a
vowel?​
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Answers: 2
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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?
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