Suppose that the national average for the math portion of the college board’s sat is 515. the college board periodically rescales the test scores such that the standard deviation is approximately 100. answer the following questions using a bell-shaped distribution and the empirical rule for the math test scores. a. what percentage of students have an sat math score greater than 615? b. what percentage of students have an sat math score greater than 715? c. what percentage of students have an sat math score between 415 and 515? d. what is the z-score for student with an sat math score of 620? e. what is the z-score for a student with an sat math score of 405?

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

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0