Use the dropdown menu to complete the probability statement using a less than or equal to sign or a greater than or equal to sign ONLY!
Note: a probability statement can be written correctly with a less than or greater than sign, but since the calculator must use an "or equal to symbol" the following is to practice rewriting in this form.
The probability of at most 4.
P(X )
The probability of more than 6.
P(X )
The probability of at least 3.
P(X )
The probability of less than 5.
P(X )
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.
Round to two decimal places.
Find the probability that at most 3 baby elk survive to adulthood.
Find the probability that less than 3 baby elk survive to adulthood.
Find the probability that more than 4 baby elk survive to adulthood.
Find the probability that at least 6 baby elk 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.
Round to two decimal places.
Find P(X < 9).
Find P(X > 8).
Find P(X > 10).
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.
Interpret the mean of X.
If we pick many, many randomly selected
Calculate the standard deviation of X to two decimal places.
Interpret the standard deviation of X. Round the mean and standard deviation to two decimal places.
The number of