Question: please I need help solving this practice question Q4.(12) Assume the time (in minutes) spent on Instagram every day for a teenager is approximately normal.

please I need help solving this practice question

Q4.(12) Assume the time (in minutes) spent on Instagram every day for a teenager is approximately normal. The mean time is 30 minutes, the standard deviation is 12 minutes. 1,(4) Randomly select one teenager, find the probability that the time he/she spends on Instagram is between 20 minutes to 50 minutes. 2.(4) Randomly select 8 teenagers, find the probability exactly 5 teenagers who spend 20 minutes to 50 minutes on Instagram. 3.(4) Assume random samples with sample size of 16, find the probability that the sample mean time spent on Instagram is less than 34 minutes

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