Employees that work at a fish store must measure the level of nitrites in the water each day. Nitrite levels should remain lower

Question

2 years ago

6

Employees that work at a fish store must measure the level of nitrites in the water each day. Nitrite levels should remain lower

than 5 ppm as to not harm the fish. The nitrite level varies according to a distribution that is approximately normal with a mean of 3 ppm.
The probability that the nitrite level is less than 2 ppm is 0.0918. Which of the following is closest to the probability that on a randomly selected day the nitrite level will be at least 5 ppm?

A .0039
B .0266
C .0918
D .7519
E .9961

These are subjects that I haven't done in a long time so if you could provide work too, that would be amazing!

Mathematics

1 answer:

kifflom [539] · Answer 1 · 2023-11-13T02:13:23+03:00

kifflom [539]2 years ago

3 0

Answer:.0039

Step-by-step explanation: we must first determine the sd of the distribution. The z score corresponding to a left tail area of .0918 is z=-1.33. We must solve -1.33=(2-3)/sd for the sd, which is .7519. Then use that to the probability of p(x>5).