91影视

The distribution of frequencies of the blood platelet count of males is as follows:

The actual measure of the mean of the blood platelet count for males is 224.3(1000 cells/$渭L$ ).

The midpoint x is computed using the class limits as follows:

$x=\frac{\text{Upper}\text{limit}+\text{Lower}\text{limit}}{2}$

Therefore, the mean is computed from the frequency distribution by the formula:

$\stackrel{炉}{x}=\frac{鈭�\left(f脳x\right)}{鈭�f}$, where frepresents the frequencies and xdenotes the midpoints of the classes.

Therefore, the values are tabulated as follows:

The mean is computed using the totals as follows:

Substituting the values in the formula, you get:

$$\begin{gathered} \stackrel{炉}{x}=\frac{34273.5}{153} \\ =224.0098 \end{gathered}$$

Thus, the mean blood platelet count of males is 224.1(1000 cells / $渭L$).

Compare it to the computed mean value. The actual mean value is almost the same as the computed mean of 224.1 (1000 cells / ).

Thus, the actual mean value is different from the one computed from the frequency distribution.