In an industrial setting, process steam has been found to be normally distributed with an average value of 25,000 pounds per hour. there is a(n) 80% probability that steam flow lies between 20,000 and 30,000 pounds per hour. what is the variance of the steam flow?

Variance is

Solution:

As per the question:

Average value of the steam, = 25000 pounds per hour,

To calculate the variance, of the steam:

where

= standard deviation

at 0.8 is 1.285 from Z-table

Thus

Variance,

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

the components of a vector are the parts of the vectors that are to each other.

b perpendicular