Answer:
D.]
Step-by-step explanation:
We will find the standard deviation and variance:
Variance= E-[
E[x] = 3.462
E[{x}^2]= 31.86
Var(x)= 31.86-(3.462)^2 = 28.4
Standard deviation =
=
= 5.833 = 6(aproximately)
Therefore, the chances of winning are equal in each lane.
The percentage of runners having times less than 14.4 sec is 0.15%. Then the correct option is A.
<h3>What is normal a distribution?</h3>It is also called the Gaussian Distribution. It is the most important continuous probability distribution. The curve looks like a bell, so it is also called a bell curve.
The times of all 15-year-olds who run a certain race are approximately normally distributed with a given mean (μ) = 18 sec and standard deviation (σ) = 1.2 sec.
The runners have times less than 14.4 sec.
The z-score is a numerical measurement used in statistics of the value's relationship to the mean of a group of values, measured in terms of standards from the mean.
Then the Percentage will be
More about the normal distribution link is given below.
Answer:
The 4th term is 7
Step-by-step explanation:
we have
step 1
Find C(2)
For n=2
step 2
Find C(3)
For n=3
step 3
Find C(4)
For n=4
therefore
The 4th term is 7