Studentexam marks(out of 100) and the number of classes theymissedin the trimester were recorded for a subject.Excel was used to investigate the potential linear relationship between these two variables.A section of the summary output is provided below:

Regression statistics

Multiple R

0.89

R square

0.79

Observations

77

Coefficients

Standard Error

Intercept

87.89

6.66

Classes missed

-6.76

1.9

What is the correlation coefficient?

Give your answer correct to two decimal places.Do NOT include units.Do NOT give a percentage.