Question

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 2.2 pounds?

Answer 1

N(2.2, 0.3)
Percent between 1.9 and 2.2
In a Normal distribution 68% of the data lies within 1 standard deviation of the mean. This is one standard deviation to the left and right TOGETHER.
1.9 is one standard deviation to the left of the mean which represents 1/2 of the 68% or 34% or .34