exam Maths Puzzle Numerical Ability

Can someone show me the answer to this question from a previous exam i have recently take please. thankyou.

Emperical Rule

Approximately what percentage of people have temperatures between 96.34 and 98.2 degrees?

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exam Other Question
The constant rate of change of a linear function is also the slope why? Five years ago a man was seven times as old as his son. Five years hence, the father will be three times as old as his son. Find their present ages.