In all answers show your calculations (Except variance calculation). But full points will be given to the correct answer). The answers without the way of calculations will affect the grade.

Question 3) Continues probability distribution (15%)

The level of electricity follows uniform distribution between 170V and 240V.

1. Find expected value and variance (4%)

1. What is the probability that level of electricity will be above 200? (4%)

1. The standard deviation of electricity is around 20V. Assume some level of electricity which is 1.5 standard deviation above mean what is the probability being below that number? (7%)

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