Topic: Averages, Statistics, Mean, Median and Mode 12. A group of 50 people were asked how many books they had read in the previous year, the results are shown in the frequency table below. ;

Calculate the mean number of books read per person.

Number of books 0 1 2 3 4 5 6 7 8

Frequency 5 5 6 9 11 7 4 2 1

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.

answer: 270

step-by-step explanation:

you have to times 200 by 1.35 to get your answer