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    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?

    Please explain?
    i got the solutions sheet here but i dont get it!
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    (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?

    Please explain?
    i got the solutions sheet here but i dont get it!
    So: \ Pr(x \leq X \leq 50.25 ) = 0.90
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    (Original post by joostan)
    So: \ Pr(x \leq X \leq 50.25 ) = 0.90
    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?
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    (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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