An outbreak of the deadly Ebola virus in 2002 and 2003 killed 91 of the 95 gorillas in 7 home ranges in the Congo. To study the spread of the virus, measure " distance" by the number of home ranges separating a group of gorillas from the first group infected. Here are data on distance and number of days until deaths began in each later group:

Distancexx	2	3	5	7	5	6
Daysyy	5	17	33	40	46	50

Use a calculator or software to find the following values.

(a) Find the mean and standard deviation of xx.

MEAN:

:

(b) Find the mean and standard deviation of yy.

MEAN:

(c) Find the correlationrrbetweenxxandyy.

ANSWER