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Part 4 of 6 (d) Find the probability that the proportion of the sampled teenagers who own a smartphone is between 0.72 and 0.80. The probability that the proportion of the sampled teenagers who own a smartphone is between 0.72 and 0.80 is .8167 Part: 4 / 6 Part 5 of 6 (e) Find the probability that less than 80% of sampled teenagers own smartphones. The probability that less than 80% of sampled teenagers own smartphones isSmartphones: A poll agency reports that 75% of teenagers aged 12 -17 own smartphones. A random sample of 234 teenagers is drawn. Round your answers to at least four decimal places as needed. Part 1 of 6 (a) Find the mean JA. The mean JA is .7500 Part 2 of 6 (b) Find the standard deviation GA. The standard deviation GA is .0283 Part 3 of 6 (c) Find the probability that more than 78% of the sampled teenagers own a smartphone. The probability that more than 78% of the sampled teenagers own a smartphone is .1446