Use the coefficient matrix below to answer the questions below about the correlation between exam scores in the ExamScores dataset.

Correlation matrix. Exam $1$: Exam $1=1,$ Exam$1$: Exam$2=0\mathrm{.}078613,$ Exam$1$:Exam$3=0\mathrm{.}256859,$ Exam$1$:Exam$4=0\mathrm{.}261306,$ Exam$2$:Exam$2=1,$ Exam$2$:Exam$3=0\mathrm{.}271642,$ Exam$2$:Exam$4=0\mathrm{.}318124,$ Exam$3$:Exam$3=1,$ Exam$3$:Exam$4=0\mathrm{.}277656,$ Exam$4$:Exam$4=1$

Link to spreadsheet

$1)$

What is the correlation coefficient between Exam$1$ and Exam$4?$