solve the average time for a student to complete this quiz is 24 24 minutes with a standard deviation of 2 minutes. What is the range of minutes needed for the middle 99.7% of the quiz timee?

The correct answer is "(18, 30) minutes".

Step-by-step explanation:

Mean,

= 24

Standard deviation,

= 2

The range of minutes where 99.7% of individuals completed the quiz will be:

=

On substituting the values, we get

=

=

now,

=

=

Or,

=

=

i.e., 18 to 30 minutes

17   x 256=4352

sorry if this is wrong, i'm new.

step-by-step explanation:

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.