3 Suppose the expected tensile strength of type A steel is 105 ksi and the...
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3 Suppose the expected tensile strength of type A steel is 105 ksi and the standard deviation of tensile strength is 8 ksi For type B steel suppose the expected tensile strength and standard deviation of tensile strength are 100 ksi and 6 ksi respectively Let X the sample aver age tensile strength of a random sample of 40 type A specimens and let the sample average tensile strength of a random sample of 35 type B specimens a What is the approximate distribution of X Of Y What is the approximate distribution of X Y Justify your answer b c d S Calculate approximately P 1 X I Calculate PX 7 10 If you actually observed X T10 would you doubt that 5
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