16. Smartphones: A Pew Research report indicated that 73% of teenagers aged 13-17 own smartphones. A random sample of 150 teenagers is drawn. a. Find the mean up b. Find the standard deviation op. c. Find the probability that more than 70% of the sampled teenagers own a smartphone. d. Find the probability that the proportion of the sampled teenagers who own a smartphone is between 0.76 and 0.80. e. Find the probability that less than 75% of the sampled teenagers own smartphones. f. Would it be unusual if less than 68% of the sampled teenagers owned smartphones