When Dennis calculates the mean age of the people who shop at the mall, will he be calculating a parameter or a statistic?

A.
Parameter

B.
Statistic

Ineed i do not understand i'm only 8

Which conjunction is disjunction is equivalent to the given absolute value inequality? |x+2|< 18

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1