The EPA fuel economy estimates for automobile models tested recently predicted a mean of 24.8 mpg and a standard deviation of 6.2 mpg for highway driving.  Assume that fuel economy has a bell-shaped distribution.  (Use the empirical rule). What percent of automobiles will have a fuel economy lower than 18.6 mpg on the highway?

Based on city pension records the average retirement age of elementary school teachers in this city is 65 years old.  The underlined value is a

The EPA fuel economy estimates for automobile models tested recently predicted a mean of 24.8 mpg and a standard deviation of 6.2 mpg for highway driving.  Assume that fuel economy has a bell-shaped distribution.  (Use the empirical rule). What percent of automobiles will have a fuel economy for highway driving between 12.4 mpg and 37.2 mpg? 

A sample of 25 married males was asked to report their age at first marriage. 25, 25, 51, 25, 38, 30, 60, 54, 31, 54, 23, 34, 25, 23, 19, 71, 26, 31, 26, 62, 29, 31, 29, 35, 25 Using the sample data above, calculate the mean. Answer to 2 decimal places.

The shape of the distribution above is

To determine if students benefit from participation in athletics, a school administrator compares the grade and attendance records of a random sample of 100 senior student athletes to a random sample of 100 senior students who are not athletes. They find that the student athletes have a higher average GPA and better attendance record than the non-athlete students. This study is

What is the specific name of the part of the muscle labeled “A” in the image below? 

Which ions must be present for a muscle contraction to occur?  Select all that apply.

What is the name of the complex labeled “A” in the image below? 

What is the organelle in the muscle cell labeled “G” in the image below?