For a certain data sample there were 4000 people surveyed. It was shown that the data was normally distributed

If the mean score for this data is 50 and the standard deviation is 5.5, how many people had a score between 39 and 50?

For a certain data sample there were 4000 people surveyed. It was shown that the data was normally distributed
The standard score for the interval in question is -2 %26lt; z %26lt; 0. For a normal distribution, about 47.72 percent of the respondents' answers would fall within this interval. This represents about 1909 people in the survey.