Use the following situation to answer Question 2:
Biologists estimate that a randomly selected baby elk has a 44% chance of surviving to adulthood. Assume this estimate is correct. Suppose researchers choose 7 baby elk at random to monitor. Let X=the number that survive to adulthood.
Use the following situation to answer Question 3:
An online spinner has two colored regions-blue and yellow. According to the website, the probability that the spinner lands in the blue region on any spin is 0.80. Assume foor now that this claim is correct. Suppose we spin the spinner 12 times. Let X=the number of times it lands in the blue region.
Use the following situation to answer Questions 4-7:
When a polling company calls a telephone number at random, there is only a 9% chance that the call reaches a live person and the survey is successfully completed. Suppose the random digit dialing machine makes 15 calls. Let X=the number of calls that result in a completed survey.
Calculate the mean of X.
Calculate the standard deviation of X to two decimal places.