how to find a standard deviation of 1 from a mean of 370 and a standard devuiation of 5

Question

The lifetime of light bulbs of a particular type are normally distributed with a mean of 370 hours with a standard deviation of 5 hours. What percentage of bulbs has lifetimes within in 1 standard deviation of the mean on either side?

Answer 1

standard deviashun=sqrt(varians), so if it =5, that impli

varians=5^2=25

varians=(sum av squares av distans from the averaej) / (number av input numbers)

dont matter wot the averaej mite be.  If yu wanna make test numbers, eezee tu

set averaej=0

1 possabel anser...distanses=3 & 4, kauz us no 3^2+4^2=5^2=25

but that wont werk, kauz averaej distans=7/2=3.5

werk onit