# Descripitve Stats Paper

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Question 1: The data shown below are chemical process yield on successive days. Construct a histogram for these data. 94.1 | 87.3 | 94.1 | 92.4 | 84.6 | 85.4 | 93.2 | 84.1 | 92.1 | 90.6 | 83.6 | 86.6 | 90.6 | 90.1 | 96.4 | 89.1 | 85.4 | 91.7 | 91.4 | 95.2 | 88.2 | 88.8 | 89.7 | 87.5 | 88.2 | 86.1 | 86.4 | 86.4 | 87.6 | 84.2 | 86.1 | 94.3 | 85.0 | 85.1 | 85.1 | 85.1 | 95.1 | 93.2 | 84.9 | 84.0 | 89.6 | 90.5 | 90.0 | 86.7 | 87.3 | 93.7 | 90.0 | 95.6 | 92.4 | 83.0 | 89.6 | 87.7 | 90.1 | 88.3 | 87.3 | 95.3 | 90.3 | 90.6 | 94.3 | 84.1 |

Question 2: The time to failure in hours of an electronic component subjected to an accelerated life test is given below. Construct histogram of these data 127 | 124 | 121 | 118 | 125 | 123 | 136 | 131 | 131 | 120 | 140 | 125 | 124 | 119 | 137 | 133 | 129 | 128 | 125 | 141 | 121 | 133 | 124 | 125 | 142 | 137 | 128 | 140 | 151 | 124 | 129 | 132 | 160 | 142 | 130 | 129 | 125 | 123 | 122 | 126 |

Question 3: The tensile strength of a metal part is normally distributed with mean 40 lb and standard deviation 8 lb. If the lower specification limit is 34 lb and upper specification limit is 48 lb, Find out the % of parts fail to meet specification?

Question 4: The output voltage of a power supply is normally distributed with mean 12 V and standard deviation 0.05 V. If the specification are at 12 0.1 V, calculate the total % rejection?

Question 5: The life of an automotive battery is normally distributed with mean 900 days and standard deviation 35 days. What % of these batteries would be expected to survive beyond 1000 days?

Question 6: The following data shows the diameter (in inches) of a sample of 40 ball bearings manufactured by certain process 0.738 | 0.729 | 0.743 | 0.740 | 0.735 | 0.731 | 0.726 | 0.737 | 0.728 | 0.737 | 0.724 | 0.735 | 0.745 | 0.736 | 0.728 | 0.742 | 0.733 | 0.742 | 0.739 | 0.725 | 0.735 | 0.732 | 0.734 | 0.738 | 0.732 | 0.735 | 0.735 |

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