After one of them is chosen for 1st, there are only 9 choices for 2nd, and then there are only 8 choices for 3rd... and so on. There are 720 different ways to pick 1st, 2nd, and 3rd place from among 10 original students
Since it takes less time in September than in June, this is a DECREASE. The percent decrease. The time is different by 114 seconds, divide this by the original time of 465 seconds and then convert to a percent, by multiplying by 100. You should get 114/465 = 0.245 then x 100 = 24.5% decrease.
Answer:
for 
and
for 
Step-by-step explanation:
Remember that the CDF of an exponental random variable is given by

where
is the parameter. In this case
so, for this case

Answer:
Step-by-step explanation:
length = l ;width = w
Perimeter of rectangle = sum of all sides
= l + w + l +w
= 2l + 2w
= 2*(l +w )