Question

Smartphones: A poll agency reports that 48% of teenagers aged 12-17 own smartphones. A random sample of 150 teenagers is drawn. Round your answers to at least four decimal places as needed. Part 1 of 6 (3) Find the meant The mean is 0.48 Part 2 of 6 (b) Find the standard deviation or The standard deviation GA is 0.0408 Part 3 of 6 (c) Find the probability that more than 50% of the sampled teenagers own a smartphone. The probability that more than 50% of the sampled teenagers own a smartphone is 0.31196 Part 4 of 6 X (d) Find the probability that the proportion of the sampled teenagers who own a smartphone is between 0.45 and 0.55. The probability that the proportion of the sampled teenagers who own a smartphone is between 0.45 and 0.55 is 0.72779 Correct Answer: 0.7259 Part 5 of 6 (e) Find the probability that less than 55% of sampled teenagers own smartphones The probability that less than 55% of sampled teenagers own smartphones is 0.95692 Part: 5/6 Part 6 of 6 (1) Would it be less than 40% of the sampled teenagers owned phones? It (Choose one) be unusual less than 107 of the sampled teenagers owned smartphones, since the proba

Answer 1