Chapter 15 P_. ASU ASU People... ASU Grades for... ASU Topic: DF 5 -... ASU IMPORTANT... G Social Media.. Untitled doc. 5. [0/4 Points] DETAILS PREVIOUS ANSWERS WANEFMAC7 9.4.017. Calculate the expected value, the variance, and the standard deviation of the given random variable X. (Round all answers to two decimal places.) X is the number of heads that come up when a coin is tossed twice. expected value variance Enter an exact number. standard deviation Need Help? Read It Watch It Submit Answer 6. [-/4 Points] DETAILS WANEFMAC7 9.4.045. MY NOTES Teenage Marketing In a certain year, 28% of all teenagers in the United States had checking accounts. Your bank, TeenChex Inc., is interested in targeting teenagers checking account. (a) If TeenChex selects a random sample of 2,000 teenagers, what number of teenagers without checking accounts can it expect to find? teenagers What is the standard deviation o of this number? (Round the standard deviation to one decimal place.) 0 = (b) Fill in the missing quantities. (Round your answers to the nearest integer.) There is an approximately 95% chance that between and teenagers in the sample will not have checking accounts. Need Help? Read It Watch It o 16,790 APR 16 itv3. [0/4 Points] DETAILS PREVIOUS ANSWERS WANEFMAC7 9.4.009. Calculate the standard deviation o of X for the probability distribution. (Round your answer to two decimal places.) O X m P(X = X) 0.4 J. 1 0.2 O = X Need Help? Read It Watch It Submit Answer 4. [-/4 Points] DETAILS WANEFMAC7 9.4.010. Calculate the standard deviation o of X for the probability distribution. (Round your answer to two decimal places.) = m + H N X P(X = x) 0.2 0.6 0.1 0.1 Need Help? Read It 16,790 APR stv C