1 A summary of 24 observations of \(x\) gave the following information:
$$\Sigma ( x - a ) = - 73.2 \quad \text { and } \quad \Sigma ( x - a ) ^ { 2 } = 2115 .$$
The mean of these values of \(x\) is 8.95 .
- Find the value of the constant \(a\).
- Find the standard deviation of these values of \(x\).