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    I have no idea how to answer any of this.

    for the part "find the probability that a randomly chosen can contains less than the nominal volume"

    I tried:

    p(x<0.450)
    z= (0.45-0.457)/sqrt(0.004)=0.1101

    p(z<-0.1101)
    which is also p(z>0.1101)
    so 1- (0.1101 answer from tables)

    ????
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    (Original post by 0utdoorz)
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    z= (0.45-0.457)/sqrt(0.004)=0.1101
    In the bit above, the square root should not be there (there's no need to take the square root - you're given the standard deviation, not the variance).
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    thanks, I worked out the first part as 0.0401
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    for the part:"the least value of mean which will comply to the law when SD=0.004"

    what do I do after this step?:
    P(x<(0.45-mean)/0.004) =0.01
 
 
 
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