Statistics I20765 marksNumerical: missing frequency meanMeasures of central tendency
The following table gives the installation time (in minutes) for hardware on 50 different computers. If the average installation time is 30.2 minutes, find missing frequencies.
The following table gives the installation time (in minutes) for hardware on 50 different computers. If the average installation time is 30.2 minutes, find missing frequencies.
$$\begin{array}{|c|ccccc|c|}\hline \text{Installation Time} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 & \text{Total} \ \text{Number of computers} & 4 & - & 10 & - & 10 & 50 \ \hline \end{array}$$
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Installation Time 0-10 10-20 20-30 30-40 40-50 Total :---::---::---::---::---::---::---: No. of computers 4 $f1$ 10 $f2$ 10 50 - Total frequency $N = 50$ - Mean $\bar{x} = 30.2$ minutes Missing frequencies: $f1$ (class 10-20) and $f2$ (class 30-40). --- $$4 + f1 + 10 + f2 + 10 = 50$$ $$f1 + f2 = ...