1. a normal distribution has a mean of 102 and a standard deviation of 2.9 what is the z-score of 105 round to nearest hundredth.
2. the ages of people at a concert are normally distributed with a mean of 24 years and a standard deviation of 3.2 years what is the age of a concert attendee with a z-score of -1.3 round to nearest hundredth

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

The average hourly earnings for a construction worker is projected to be $24.50 in 2012. jason wants to join the construction work force after he graduates in 2012. his friend tells him that average hourly earnings for construction workers will rise by 2% from 2009 to 2012. based on the data below, assuming that the projected hourly earnings are correct, is jason’s friend’s statement accurate? construction industry - average hourly earnings, 2000-2009 a. his friend’s statement is accurate. the average hourly earnings will increase by 2%. b. his friend’s statement is not accurate. the percent increase will be more than 2% c. his friend’s statement is not accurate. the percent increase will be less than 2% d. his friend’s statement is not accurate. the average hourly earnings will decrease

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?