From 15,000 graphing calculators produced by a manufacturer, an inspector selects a random sample of 450 calculators and finds 4 defective
calculators. Estimate the total number of defective calculators out of the 15,000.

Question

From 15,000 graphing calculators produced by a manufacturer, an inspector selects a random sample of 450 calculators and finds 4 defective 
calculators. Estimate the total number of defective calculators out of the 15,000.

anonymous · Answer

: You could also do this as a test of homogeneity, Case 7. The χ²-Test gives χ² = 4.98, df = 1, p=0.0256

highschoolmom2010 · Answer

what is that^^

anonymous · Answer

its a sign for when u go up on a calculator

highschoolmom2010 · Answer

ive never used that before so im kind of confused on what to do

anonymous · Answer

OH

ganeshie8 · Answer

in 450 calculators, 4 are defective

ganeshie8 · Answer

in 15000 calculators, how many are defective ?

ganeshie8 · Answer

$\large  \frac{450}{4} = \frac{15000}{x}$

ganeshie8 · Answer

solve x

highschoolmom2010 · Answer

do i cross multiply?

ganeshie8 · Answer

yup

highschoolmom2010 · Answer

60,000=450x

ganeshie8 · Answer

yes, keep going

highschoolmom2010 · Answer

x=133.3

ganeshie8 · Answer

$\large \color{red}{\checkmark}$

ganeshie8 · Answer

since u cannot have 133.3 calculators, u can say, approximately 133 calculators will be defective in 15000

highschoolmom2010 · Answer

i forgot to round lol :) thanks @ganeshie8 @jswagger for the help :)

ganeshie8 · Answer

np :)

beccaboo333 · Answer

Trust what @ganeshie8 says, he is amazing with math. Sorry for making a post about it on yours. If you ever need more help.. tag him.. :3

highschoolmom2010 · Answer

i know @ganeshie8  is great with math he has helped me many times :)