Homework Help: math

Posted by darlene on Tuesday, February 14, 2012 at 12:08am.

a factory produces 150,000 lightbulbs per day. the manager of the factory estimates that fewer than 1,000 defictive bulbs are produced each day . in a random sample of 250 lightbulbs , there are 2 defictive bulbs . determine whether the managers estimate is likely to be accurate. explain.

math - Henry, Thursday, February 16, 2012 at 4:35pm
% Estimated=(1000/150000) * 100%=0.67 %

% Defective = (2/250) * 100% = 0.8 %.

(0.8% /0.67%) * 100% = 119%.
119% - 100% = 19 %.

The actual % is about 19% higher than the estimated %.

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