An education official is interested in the percentage of the adult population over 20 years, in his city, who has read at least one book during the last year. How can he investigate this question using descriptive statistics tools?

nothjing

step-by-step explanation:

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here