$27$ An $\stackrel{}{x}$ and $R$ chart was prepared for an operation using twenty samples with five pieces in sample. $\stackrel{}{x}$ was found to be $33\mathrm{.}6$ and $\frac{?}{\text{b}\text{a}\text{r}}(R)$ was $6\mathrm{.}2.$ During production a sample of five was taken and the pieces measured $36,43,37,25,$ and $38.$ At the time the sample was taken

Only the range was outside control limits

Neither the average nor range were within control limits

Only the average was outside control limits

Both the average and range were within control limits

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