At the baseball park, PNC Park, vendors' earnings depend upon crowd size, weather etc. It has been found that a vendor will earn an average of $ 8,960 per year with standard deviation= $325. It was also found that this average represents the middle 62.08 % of all data. Vendor union rep, Amos, wants to determine the lower and upper earnings limit bounded by the 62.08%. Find both limits-round your answer to 2 decimal places. Statistics

this question is not clearly addressed in hindi

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.