If the students were to increase the sample size to n = 200 pieces of marbles each, what will the effect be on the center and variability of the sampling distribution? The center would remain about the same. The variability would increase.
The center would remain about the same. The variability would decrease.
The center would decrease. The variability would increase.
The center would increase. The variability would decrease.

21/58.

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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.