Question

(5 points, 1 point each) According to survey data by Global Webindex, people spend an average of 2 hours and 22 minutes (142 minutes) per day on social media. The sample standard deviation given was 43 minutes. Assume this data is normal distributed an answer the following questions. a. What is the probability that a randomly selected person spends more than 2 hours on social media? b. What is the probability that a randomly selected person spends exactly 90 minutes on social media? c. What is the probability that a randomly selected person spends between 120 and 150 minutes on social media? d. What is the probability that a randomly selected person spends at most 2 hours on social media? e. What is the probability that a randomly selected person spends at least 3 hours on social media?

Answer 1

salution: M=1429 <a) P(x>120) = P123 120-142) 143 - Plas-0.51) = 0.6950 : o <b> P(x=90) (C) P (120CX (150)=P(120-142 e 2, 150-142) 190CX (150)=1 43 43 =P(-0.siehe 0:19) = [0.27037 (d) PCX (120) = 1- P(x *120) = 10.3050] (0) P(x >180) = P(as 180-142) Plas 0.88) 43 10:1894