The length of a screw produced by a machine is normally distributed with a mean of 0.75 inches and a standard deviation of 0.01 inches. What percent of screws are between 0.72 and 0.78 inches? @CrazyTurtle483 @cj49 @aum @tipsforlovesjpwkop @toxicsugar22

Question

cj49 · Answer

http://www.algebra.com/algebra/homework/Probability-and-statistics.faq.question.869645.html

anonymous · Answer

Answer choices: (My bad)

68% 

 75% 

 99.7% 

 100%

amistre64 · Answer

do you recall the empirical rule?

anonymous · Answer

yes and I got c but, I think it was wrong answer

amistre64 · Answer

if you mean the third one, that seem fine to me

amistre64 · Answer

as was posted earlier;  -3, +3 is the empirical rule for within 3 sd of the mean

amistre64 · Answer

68, 95, 99 is what i recall it as so 99.7 is prolly what your material uses

anonymous · Answer

yes I mean the third one