Answer:
2- B
3- A
Step-by-step explanation:
Answer:
15.87%
Step-by-step explanation:
Given that:
The mean (μ) = 1000 hours, the standard deviation (σ) = 100 hours.
The z score provides a means of measurement in statistics to determine the variation of a raw score from the mean. The z score is given as:

To find that a randomly chosen light bulb will last less than 900 hours:

Therefore, P(x < 900) = P(z < -1) = 0.1587 = 15.87%
Answer:
f(x) * g(x) =(7x-9)(2x+1)
=14x^2+7x-18x-9
=14x^2-11x-9
Answer:
I think the answer is the 1st one,3