Chocolate bars produced by a certain machine are
labeled with 8.0 ounces. The distribution of the actual weights of
these chocolate bars is Normal with a mean of 8.1 ounces and a
standard deviation of 0.1 ounces. A chocolate bar is considered
underweight if it weighs less than 8.0 ounces. How should the
chocolate bar wrappers be labeled so that only 1% of such bars are
underweight?
7.77 ounces
7.87 ounces
8.23 ounces
8.33 ounces
µ=8.1
σ = 0.1
proportion=0.01
Z value at 0.01= -2.326 (excel formula =NORMSINV(0.01) )
z=(x-µ)/σ
so, X=zσ+µ= -2.326*0.1+8.1
X=7.87
so, answer is 7.87 ounces
Chocolate bars produced by a certain machine are labeled with 8.0 ounces. The distribution of...
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