Research suggests that there is an optimal amount of health anxiety. At too low levels, the individual never worries about their health and takes unnecessary health risks. At too high levels, the health anxiety can have a negative impact on daily functioning and well-being. To further understand health anxiety, a researcher collects data from 42 individuals from the general population on their health anxiety using a validated questionnaire. The sample has a mean of 15.9 with a standard deviation of 6.3. The data are normally distributed. The ideal range of health anxiety scores is 14 through 26. What proportion of the sample have optimal levels of health anxiety?