Answer:
The sample proportion of 'successful' people is
.
Explanation:
The sample consist of 64 people and 48 of them are 'successful'. Hence, the proportion of 'successful' people is:

Where:
- People that forms the sample, dimensionless.
- People classified as 'successful', dimensionless.
Given that
and
, the sample proportion of 'successful' people is:


The sample proportion of 'successful' people is
.