Problem 8. Outdoor Laptop

Durable Devices Ltd. has just completed an extensive survey of all individuals who purchased their popular Outdoor laptop brand. The survey indicates that the time to first failure for this Outdoor brand is normally distributed with a mean of 50 months and a standard deviation of 12 months. Suppose an Outdoor Laptop owner is randomly selected. Use StatCrunch to compute the following probabilities, starting with an untitled StatCrunch Datasheet.

a. Find the probability that the time to first failure will be at most 48 months. Copy and paste the graph and the probability to the Word file Assignment3B under the subheading Problem 8a. [1 mark]

t. Find the probability that the time to first failure will be at least 36 months. Copy and paste the graph and the probability to the Word file Assignment3B under the subheading Problem 8b. [1 mark]

u. Find the probability that the time to first failure will be more than 60 months. Copy and paste the graph and the probability to the Word file Assignment3B under the subheading Problem 8c. [1 mark]

Problem 9. Warranty

a. Referring to problem 8 above, suppose that Durable Devices is willing to repair/service only 1% of the Outdoor Laptop brand under warranty. What warranty period (in months) should they offer to their customers? Copy and paste the graph and the normal value [3 marks]