The probability density function of x , the lifetime of a certain type of electronic device (measured in hours), is given by f ( x ) = { 10 x 2 x > 10 0 x ≤ 10 find p { x > 20 } . what is the cumulative distribution function of x ? what is the probability that of 6 such types of devices, at least 3 will function for at least 15 hours? what assumptions are you making?

a) P(X>20) = 1/2

b) Cumulative distribution of X = {1 - 10/y 0 y>10 0<y<10

c) 0.9

Step-by-step explanation:

81 seats

step-by-step explanation:

if you multiply 0.65 times 125 then you get 81.5 seats. well since you can't have half of a seat you have to round down and get 81 seats in the no children zones. that leave 44 seats outside of the no children zone.

your answer is  

d.

196.5 m2

step-by-step explanation: