The table shows exam scores of students who watched a certain number of hours of television per week:
hours of tv 1 2 3 4 5 6 7 8 9 10
exam score 98 96 95 94 90 85 81 80 75 72
calculate the correlation coefficient.
-0.99 -0.89 -0.79 -0.69

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Jonathan puts $400 in a bank account. each year the account earns 6% simple interest. how much interest will be earned in 5 years?