You are a mechanic who is measuring the valve clearance on a motorcycle engine. the current clearance for one of rhe valves is 0.30 millimeter (mm). the clearance should be at least 0.18 mm and no more than 0.22 mm. the valve clearance is set by using a spacer that reduces the distance between the cam and the valve by the millimeter, should you use to achieve a correct valve clearance?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?