The following dataset represents the test scores of 15 randomly selected students in a recent statistics exam out of a total score of 130: . The first quartile of the scores is _______ ?

Given E(X)=5 , E(Y)=3, ,  and Cov(X,Y)=2, what is ?

Which of the following is NOT a measure of dispersion?

Given E(X)=5 , E(Y)=3, ,  and Cov(X,Y)=2, what is E(2X+3Y)?

Current Salaries of employees of a manufacturing company are visualized in the histogram below.  Which of the following statements is true about the salaries of the employees? The mean salary is greater than the median salary. The mean salary is less than the median salary. The distribution of the salaries is skewed to the right. The distribution of the salaries is approximately symmetric.

The following dataset represents the test scores of 15 randomly selected students in a recent statistics exam out of a total score of 130: . How many outliers are in this dataset?  

If f(x,y) is the joint pdf of continuous random variables X and Y, which of the following is true?

The following dataset represents the test scores of 15 randomly selected students in a recent statistics exam out of a total score of 130: . The histogram of the data is pasted below; Describe the shape of the distribution. It is

The following dataset represents the test scores of 15 randomly selected students in a recent statistics exam out of a total score of 130: . The third quartile  of the scores is _______ ?

The empirical rule states that for a normal distribution, approximately how much data falls within one standard deviation of the mean?