here std deviation =0.25
and for 99% level ; z=2.3263
as we know that z score =(X-mean)/std deviation
2.3263 =(20-mean)/0.25
mean =20-0.25*2.3263=19.4184
A machine at Ken's Ketchup Corporation fills 20-ounce ketchup bottles. The machine can be adjusted to...
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