The life-time in hours of a certain electrical equipment has the normal distribution with mean=80 and standard deviation=16. I. What is the probability that the equipment that the equipment lasts at least 100 hours?
II. If the equipment has already lasted 88 hours, what is the conditional probability that it will last at least another 12 hours?

answer

explanation

the area of a circle is calculated using the formula

or

we can use any of the above formulae to calculate the required. preferably, let us use the latter since the diameter is

we substitute the diameter into the formula to get:

this is the exact value for the area of the circle.

the correct answer is a

b

step-by-step explanation:

calculate the scale factor as the ratio of corresponding sides, image to original, that is

scale factor = = = = 1