An olevator has a placard stating that the maximum capacity is 1920 lb-12 passengers. So, 12 adult male passengers can have a mean weight of up lo 1920/12 160 pounds. If the elevator is loaded with 12 adult malo passengers, find tho probability that it is overloaded because they have a moon weight greater than
160 lb (Ausume that weights of malos ara normally distributed with a mean of 165 lb and a standard deviation of 36 lb.) Does this olevator appear to be safe?
The probability the olovator is overloaded is
(Round to four decimal places as noodod.)
br
or

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.

6e14 is the answer.