A frequency distribution of weights (kg): $40$-$45$: $6$, $45$-$50$: $9$, $50$-$55$: $11$, $55$-$60$: $4$.…
A frequency distribution of weights (kg): $40$-$45$: $6$, $45$-$50$: $9$, $50$-$55$: $11$, $55$-$60$: $4$. What fraction of total students has weight in $50$-$55$ kg?
$\dfrac{11}{30}$
$\dfrac{1}{3}$
$\dfrac{11}{20}$
$\dfrac{4}{30}$
Solution
Total $= 6+9+11+4 = 30$. Fraction $= \dfrac{11}{30}$.