Given the following data on minutes spent on a specific activity, calculate the average minutes and determine the number of individuals who spent more than 60 minutes.

The data points are:
$50, 80, 70, 58, 53, 50$
$49, 36, 76, 57, 64, 50$
$84, 71, 83, 72, 78, 75$
$84, 72, 69, 49, 66, 48$
$42, 65, 88$
The total number of observations is $n = 30$.

The average is given by the formula $\bar{x} = \frac{\sum x}{n}$.

Based on the average of approximately 57.97 minutes, a suitable number of minutes to be added to the menu would be the closest whole number.
The suitable number of minutes is $\boxed{\text{58 minutes}}$.

The values greater than 60 are:
$80, 70, 76, 64, 84, 71, 83, 72, 78, 75, 84, 72, 69, 66, 65, 88$.
There are 16 such values.

The estimated number of people who prefer minutes greater than 60 is $\boxed{16}$.