Answer
See below.
Work Step by Step
The mean of $n$ numbers is the sum of the numbers divided by $n$. The median of $n$ is the middle number of the numbers when they are in order (and the mean of the middle $2$ numbers if $n$ is even). The mode of $n$ numbers is the number or numbers that appear(s) most frequently. Hence here the mean: $\frac{6.24+6.35+6.37+6.72+6.76+6.78+6.82+6.96+ 6.99+7.06+ 7.07+ 7.12+ 7.14+7.40}{14}\approx6.84$, the median is the average of the middle $2$ in the sequence in the denominator, which is: $6.8$, there is no mode since all elements appear the same amount of times. The range is the difference between the largest and the smallest data value. The standard deviation of $x_1,x_2,...,x_n$ is (where $\overline{x}$ is the mean of the data values): $\sqrt{\frac{(x_1-\overline{x})^2+(x_2-\overline{x})^2+...+(x_n-\overline{x})^2}{n}}$. Hence here the range is: $34-19=15$ and the standard deviation is: $\sqrt{\frac{(6.24-6.84)^2+(6.35-6.84)^2+(6.37-6.84)^2+(6.72-6.84)^2+(6.76-6.84)^2+(6.78-6.84)^2+(6.82-6.84)^2+(6.96-6.84)^2+ (6.99-6.84)^2+(7.06-6.84)^2+ (7.07-6.84)^2+ (7.12-6.84)^2+ (7.14-6.84)^2+(7.40-6.84)^2}{14-1}}\approx0.324$
