Answer
(a)
Work Step by Step
We can get the number of accidental injuries by summing the numbers of the first column: $295+655+239+363=1552$.
The number of 14-18 year olds is the sum of the numbers in the second row: $655+916=1571$
The expected count can be obtained by multiplying the two obtained numbers and dividing it by $n$: $\frac{1552\cdot1571}{4111}\approx593.09$, thus the answer is (a):
