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When taking a 15 question multiple choice test, where each question has 3 possible answers, it would be unusual to get or more questions correct by guessing alone. Give your answer in the box above as a whole number. Submit Question Jump to Answer 0/1 pt 399 Details About 3% of the population has a particular genetic mutation. 900 people are randomly selected. Find the standard deviation for the number of people with the genetic mutation in such groups of 900. Round your answer to three decimal places Question 21 Submit Question Jump to Answer Question 22 0/1 pt 399 Details The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 63 and a standard deviation of 6. Using the Empirical Rule rule, what is the approximate percentage of lightbulb replacement requests numbering between 63 and 81? Do not enter the percent symbol. % ans =
A ping pong ball is drawn at random from an urn consisting of balls numbered 2 through 10. A player wins 1 dollar if the number on the ball is odd and loses 1 dollar if the number is even. What is the expected value of his winnings? A card is drawn at random from a standard deck of playing cards (no jokers). If it is red, the player wins 1 dollar; if it is black, the player loses 2 dollars. Find the expected value of the game. In a class there are 20 students: 3 are 5' 6", 5 are 5'8", 4 are 5'10", 4 are 6', and 4 are 6' 2". A student is chosen at random. What is the student's expected height? inches Submit Question Jump to Answer Question 17 If a seed is planted, it has a 80% chance of growing into a healthy plant. If 7 seeds are planted, what is the probability that exactly 2 don't grow? Submit Question Jump to Answer Question 18 0/1 pt 399 Details 0/1 pt 399 Ⓒ Details About 9% of the population has a particular genetic mutation. 900 people are randomly selected. Find the mean for the number of people with the genetic mutation in such groups of 900.