The ages of the 200 individuals in a supplied health data set are grouped below.
Age a (years)10≤a<2020≤a<3030≤a<4040≤a<5050≤a<6060≤a<7070≤a<8080≤a<90Frequency3226392620231519\begin{array}{c|cccccccc}\text{Age }a\text{ (years)}&10\leq a<20&20\leq a<30&30\leq a<40&40\leq a<50&50\leq a<60&60\leq a<70&70\leq a<80&80\leq a<90\\\hline\text{Frequency}&32&26&39&26&20&23&15&19\end{array}Age a (years)Frequency10≤a<203220≤a<302630≤a<403940≤a<502650≤a<602060≤a<702370≤a<801580≤a<9019
State the modal class.
Find the probability that an individual selected at random from the data set is aged at least 70.