1. Assume that the average yearly pay of all teachers in the Philippines follows a normal distribution with a mean of 51, 000 pesos and a standard deviation of 6000 pesos. Calculate the likelihood that a randomly picked teacher's yearly pay will fall between 42,000 and 65,000. 2. The average time it takes a computer repair firm to diagnose a computer is 50 minutes, with a standard variation of 12 minutes. Every day, the firm shuts at 4:00 p.m. If a technician begins diagnosing at 3 p.m., what is the likelihood that he will complete his work before closing for the day? 3. The laptop's life span follows a normal distribution, with a mean of 58 months and a standard deviation of 10 months. The firm offers a 36-month guarantee on malfunctioning laptops. How many laptops may be changed if the firm produces 1 million laptops each year?

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