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Assume the time (in hours) spent on watching TV every day is approximately normal. The mean time is 2 hours, the standard deviation is 0.5

Assume the time (in hours) spent on watching TV every day is approximately normal. The mean time is 2 hours, the standard deviation is 0.5 hours.

1. Randomly select one individual, find the probability that the time he/she spends on watching TV is more than 2.5 hours every day.

2. Randomly select 15 individuals, find the probability exactly 3 individuals who spend more than 2.5 hours on watching TV every day.

3. Assume random sample with sample size of 16, find the probability that the sample mean time spent on watching TV is less than 1.8 hours.

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