An elephant weighs 15,000 pounds on Earth and 2,500 pounds on the Moon. Assuming the weights are proportional, what percent of i
1 answer:
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Answer:
The value of x for the given expression is
Step-by-step explanation:
Given as :
<u>The expression is written </u>
3 - 1
× x = 1
Or, 1 × x = 3
- 1
Or, × x =
- 1
Or, × x =
- 1
Or, × x =
Or, × x =
∴ x =
Or, x =
I.e x =
So, The value of x =
Hence The value of x for the given expression is Answer
Answer:
In order to find the variance we need to calculate first the second moment given by:
And the variance is given by:
And the deviation would be:
Step-by-step explanation:
Previous concepts
The expected value of a random variable X is the n-th moment about zero of a probability density function f(x) if X is continuous, or the weighted average for a discrete probability distribution, if X is discrete.
The variance of a random variable X represent the spread of the possible values of the variable. The variance of X is written as Var(X).
Solution to the problem
For this case we have the following distribution given:
X 3 4 5 6
P(X) 0.07 0.4 0.25 0.28
We can calculate the mean with the following formula:
In order to find the variance we need to calculate first the second moment given by:
And the variance is given by:
And the deviation would be: