9. The weights of bats in a zoo are normally distributed with a mean of 2.2 pounds and a standard deviation of 0.3 pounds. About what percent of the bats at the zoo weigh between 1.9 pounds and 2.5 pounds?

Question

amistre64 · Answer

subtract your mean from each given value ... what are the results?

amistre64 · Answer

spose we are given 2 values:  a and b , with a mean of say, u

what is:  a-u
     and: b-u

for starters ....

anonymous · Answer

I don't believe I understand... sorry, I'm a bit thick when it comes to math xD Would it be 2.2 - 0.3?

amistre64 · Answer

0.3 is defined in the problem to be our "standard deviation";
the "mean" is defined to be:  2.2

we are given two values to examine:   1.9 and 2.5 

lets subtract  2.2  from each of these values so that we can compare them against the standard deviation