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 %.

math  Sassy, Tuesday, November 18, 2014 at 7:22pm
Set up the proportion 150,000 over x= 250 over two. Cross multiply 150000 and two to get 300000. Set up the equation 300,000=250x. Divide both sides with 250 to get the answer.
Answer This Question
Related Questions
 Math  Jim has 87 lightbulbs to put into packages of 4 bulbs each. Before he ...
 Integers  Billy buys 3 doze light bulbs. After changing the lightbulbs in the ...
 Probability  A company produces light bulbs, and finds that approximately 2% of...
 Statistics  A certain type of lightbulb is advertised to have an average ...
 probability  3. A bag contains five different lightbulbs. The bulbs are the ...
 Physic  CFL light bulbs consume less power than their incandescent counterparts...
 Accounting  During the period, labor costs incurred on account amounted to $...
 accounting  6. Acme Manufacturing Company estimates factory overhead as a ...
 calculus  A MANUFACTURE OF LIGHTBULBS HASS SAMPLED 40 BULBS IN ORDER TO ...
 Business Statistics  The quality control manager at a light bulb factory needs ...
More Related Questions