routine check is to be conducted on a filling machine for "200g" yoghurt containers. For this machine, the standard

deviation of the weight poured into each container is known to be 12g. In the checking procedure, a random sample of

50 containers is examined. The contents are found to have a mean weight of 207g.

Part A

Find the full width of a 99% confidence interval for the true mean contents. Give your answer to 2 decimal places in the

form x.x