Refer to the following list of numbers of years that former CEOs of major technology companies lived after their official retirement:

18, 22, 15, 30, 12, 25, 40, 14, 20, 28, 35, 50

Identify any obvious outliers in the dataset using the interquartile range (IQR) method.

If the third quartile $Q_3$ of a data set is known, which percentile does it correspond to?

Find the five-number summary for the data set: $21$, $25$, $23$, $22$, $24$, $26$, $28$, $29$, $27$, $25$, $24$, $23$, $22$, $21$, $23$, $24$, $25$, $26$, $27$, $28$, $29$, $30$, $28$, $27$, $26$, $25$, $24$

The following data set shows the battery lives in hours of $28$ different smartphone models: $10$, $12$, $14$, $16$, $18$, $20$, $22$, $24$, $26$, $28$, $30$, $32$, $34$, $36$, $38$, $40$, $42$, $44$, $46$, $48$, $50$, $52$, $54$, $56$, $58$, $60$, $62$, $64$. About how many smartphone models have battery lives at or below the third quartile?