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Smartphones: A poll agency reports that 80% of teenagers aged 12-17 own smartphones. A random sample of 250 Espanol teenagers is drawn. Round your answers
Smartphones: A poll agency reports that 80% of teenagers aged 12-17 own smartphones. A random sample of 250 Espanol teenagers is drawn. Round your answers to at least four decimal places as needed. Part 1 of 6 (a) Find the mean JA. P The mean JA is 0.8 X Part 2 of 6 (b) Find the standard deviation on. p The standard deviation on is 0.0253 X Part 3 of 6 (c) Find the probability that more than 82% of the sampled teenagers own a smartphone. The probability that more than 82% of the sampled teenagers own a smartphone is 0.2148( Espac (d) Find the probability that the proportion of the sampled teenagers who own a smartphone is between 0.73 and 0.85 The probability that the proportion of the sampled teenagers who own a smartphone is between 0.73 and 0.85 is -- (e) Find the probability that less than 85% of sampled teenagers own smartphones. The probability that less than 85% of sampled teenagers own smartphones is 0.9760 . (f) Would it be unusual if less than 75% of the sampled teenagers owned smartphones? It be unusual if less than 75% of the sampled teenagers owned smartphones, since the probability is -|
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