Ich help video The following table represents the highest educational attainment of all adult
residents in a certain town. If a resident who has completed only a bachelor's degree
is chosen at random, what is the probability that they are aged 40 or over? Round
your answer to the nearest thousandth.
Age 20-29 Age 30-39 Age 40-49 Age 50 & over Total
High school only 1434
822
288
2022 4566
Some college 1340
862
790
5006
2014
Bachelor's degree
1683
1610
1010
576
4879
Master's degree
990
712
704
1068
3474
Total
5447
4006
2792
5680
17925

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all it means is function 3

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.