A researcher was interested in how much Vitamin C adults had in their daily diets. • The researcher surveyed 100 random adults.
• She made a box plot based on the amounts of Vitamin C in the diets of the 100 adults.

What percent of those in the survey get at least 90 milligrams of Vitamin C?

A. between 25% and 50%

B. between 50% and 75%

C. less than 25%

D. more than 75%

the answer is c)8

step-by-step explanaction:

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.