Manguilimotan65idn
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1. What data are needed to calculate the expected mean?
2. What is the formula for the mean of discrete random variable?
3. What is the formula in getting the variance of a discrete random variable?
4. What does the value of variance indicate?​

Sagot :

Impretty242006idn

Answer:

1.To find the expected value, E(X), or mean μ of a discrete random variable X, simply multiply each value of the random variable by its probability and add the products. The formula is given as. E ( X ) = μ = ∑ x P ( x ) .

2.The mean μ of a discrete random variable X is a number that indicates the average value of X over numerous trials of the experiment. It is computed using the formula μ=Σx P(x).

3.To calculate the Variance: square each value and multiply by its probability. sum them up and we get Σx2p. then subtract the square of the Expected Value μ

Explanation:

4.The variance is a measure of variability. It is calculated by taking the average of squared deviations from the mean. Variance tells you the degree of spread in your data set. The more spread the data, the larger the variance is in relation to the mean.

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