Answer
$\mu$ is between -26.06 and 32.04. This interval is a much wider than the one in exercise 21.
Work Step by Step
In exercise 21 the first value is 3. Hence then the interval becomes: $\mu$ is between$ 3-9.68\cdot 3=-26.06$ and $ 3+9.68\cdot 3=32.04 .$ This interval is uch wider than the one in exercise 21.
