Domain and range of the function and it’s inverse
1 answer:
Answer:
B (second table in list)
Step-by-step explanation:
The function is a quadratic with vertex and y-intercept at (0,-2). The parabola opens up meaning only y - values above -2 are a part of the function. Since range is the set of all y values, then the range is .
The domain is not restricted and it is all real numbers.
The inverse of the function is where x and y are switched. So the range becomes the domain and vice verse.
This means the domain of the inverse is and the range of the inverse is all real numbers.
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Answer:
X 0 1 2 3
P(X) 0.27 0.51 0.17 0.05
And replacing we got:
Step-by-step explanation:
Let X the random variable that represent "the number of buckets of popcorn purchased by patrons during one night at the movies"
And we have the following distribution for X
X 0 1 2 3
P(X) 0.27 0.51 0.17 0.05
In statistics and probability analysis, the expected value "is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values".
The variance of a random variable Var(X) is the expected value of the squared deviation from the mean of X, E(X).
And the standard deviation of a random variable X is just the square root of the variance.
For this case we can calculate the expected value with the following formula:
And replacing we got: