Confidence votes 978. The range of 60-70 decibels sound pressure level is about as loud as normal conversation in 1 meter distance. The distance from the ears to the sound source is very important to the value of the SPL.
A fraction (from Latin fractus, broken) represents a part of a whole or, more generally, any number of equal parts. When spoken in everyday English, a fraction describes how many parts of a certain size there are, for example, one-half, eight-fifths, three-quarters.
Proportion. Proportion is the fraction of a population who have a characteristic of interest. Those who are included in the numerator are also included in the denominator. As the numerator is a subgroup of the denominator the value is always between 0 and 1. Values can be expressed as a percentage by multiplying by 100.