Explanation
Step 1
the probabily of a event can be calculated:
[tex]P=\frac{favorable\text{ outcomes}}{\text{total outcomes}}[/tex]Let
favorable outcomes=days that begins with the letter T
Hence
[tex]\begin{gathered} \text{favorable outcomes=}\lbrace Tuesday,thursday\rbrace \\ \text{favorable outcomes=}2 \end{gathered}[/tex]and
[tex]\text{total outcomes= 7}[/tex]because the week has 7 days
Step 2
Replace
[tex]\begin{gathered} P=\frac{favorable\text{ outcomes}}{\text{total outcomes}} \\ P=\frac{2}{\text{7}} \\ P=\frac{2}{7} \end{gathered}[/tex]I hope this helsp you