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# dont get this question watch

1. 6. the probability density function of the net weight in pounds of a packaged chemical herbicide is

f(x)= 2 for 49.75<x<50.25 pounds

b)How much chemical is contained in 90% of all packages?

i got the solutions sheet here but i dont get it!
2. (Original post by lingwin1993)
6. the probability density function of the net weight in pounds of a packaged chemical herbicide is

f(x)= 2 for 49.75<x<50.25 pounds

b)How much chemical is contained in 90% of all packages?

i got the solutions sheet here but i dont get it!
So:
3. (Original post by joostan)
So:
OK here is another question :

10. Suppose that the thickness of a cylinder has a normal distribution with a mean 1.41cm and a standard deviation of 0.01cm.

What is the probability that a thickness is greater than 1.42cm?

Can you teach me approximation?

For this, i used the normal distribution equation and i got it wrong . Please try to explain?
4. (Original post by lingwin1993)
OK here is another question :

10. Suppose that the thickness of a cylinder has a normal distribution with a mean 1.41cm and a standard deviation of 0.01cm.

What is the probability that a thickness is greater than 1.42cm?

Can you teach me approximation?

For this, i used the normal distribution equation and i got it wrong . Please try to explain?
Allow me to direct you here.
See number 3. Remember the normal distribution is symmetric, and 1.42 is one sd out.

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