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: $\frac{43+44+45+47+48+55+56+56}{8}=49.25$, the median is the mean of the middle items in the sequence $ 43,44,45, 47, 48, 55,56,56$, which is: $(47+48)/2=47.5$, the mode is $56$. 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: $56-43=13$ and the standard deviation is: $\sqrt{\frac{(43-49.25)^2+(44-49.25)^2+...+(56-49.25)^2}{8}}\approx5.127$
