Question

40. The Screw Right Company claims their 34 inch screws are within ±0.23 of the claimed mean diameter of 0.750 inches with a standard deviation of 0.115 inches. The following data were recorded. 0.757 0.723 0.754 0.737 0.757 0.741 0.722 0.741 0.743 0.742 0.740 0.758 0.724 0.739 0.736 0.735 0.760 0.750 0.759 0.754 0.744 0.758 0.765 0.756 0.738 0.742 0.758 0.757 0.724 0.757 0.744 0.738 0.763 0.756 0.760 0.768 0.761 0.742 0.734 0.754 0.758 0.735 0.740 0.743 0.737 0.737 0.725 0.761 0.758 0.756

The screws were randomly selected from the local home repair store.

a. What is the mean diameter for the sample? Round answer to 3 decimal places (i.e. 0.123) _________Answer

b. What is the standard deviation for the sample? Round answer to 3 decimal places (i.e. 0.123) ___________Answer

c. Find the probability that 50 randomly selected screws will be within the stated tolerance levels. Round answer to 3 decimal places (i.e. 0.123) _________Answer

Answer 1

시:0-750 and 620.115 0.94-682 V 1毛 -0.0123 2 -0.23' 0.23 0-1 ㄨㄧㄑ