assume that 21 year old womens heart rate at rest are normally distributed with a nean of 70 bpm and a standard deviation of 8 bpm. if 300 women are examined how many would ypu expect to have a heart rate of less than 74?

Question

anonymous · Answer

what % is included into the standard deviation.... i've forgotten this =/

anonymous · Answer

it would be nearly 70+% ,

anonymous · Answer

hv a look at table

anonymous · Answer

http://en.wikipedia.org/wiki/68-95-99.7_rule

anonymous · Answer

Is it 210?

anonymous · Answer

@outkast but it is half standard deviation .

anonymous · Answer

@adorebea84  not sure but near by it.

anonymous · Answer

you sure it's half a standard deviation... 70 to 74 is half a standard deviation but it's asking less than 74. wouldn't that mean all values within the standard deviation below 70 also ?

anonymous · Answer

<--- haven't taken statistics, going on knowledge from ENG physics

anonymous · Answer

it 69.1 % of 300, 207 nearly is the ans 

damm sure

anonymous · Answer

ok thanks :)

anonymous · Answer

http://www.regentsprep.org/Regents/math/algtrig/ATS2/NormalLesson.htm view graph for confirmation