Answer to Question #349920 in Statistics and Probability for Ttypre

Question

1. On the day before an exam in an online class, students e-mailed questions to the professor at a rate of 1 every 20 minutes, exponentially distributed. Determine the probability that that the interval between succeeding messages is more than an hour.

2. For an exponential distribution, what is the probability that the value of the exponential random variable with parameter µ=3.2 will be having a value higher than 0.2353?

3. A normal distribution has a mean of 80 and a standard deviation of 12. What is the probability of selecting a value between 70 and 85?

Answer 1

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