What proportion of these students could run a mile between 5.63 minutes and 7.85

Question

What proportion of these students could run a mile between 5.63 minutes and 7.85 minutes? Mechanical measurements on supposedly identical objects usually vary. The variation often follows a Normal distribution. The stress required to break a type of bolt varies Normally mean 75 kilopounds per square inch ks and standard deviation 8.3 ksi. Determine the percent to 4 decimal places of these bolts that will with standard a stress between 65 and 80 ksi without breaking using your T1-84? Using your TI-84. determine what stress is required to ensure that a bolt is in the top 20% without breaking? Exercise and diet are common factors that affect diabetic symptoms and their need for insulin. A study done at a region hospital collected data from diabetic patients for one month on their daily caloric intake and blood sugar levels; the data is below.

Explanation / Answer

10.

mean = 75
stdev= 8.3
P(65<X<80)
= P( (65-75)/8.3 Z< (80-75)/8.3)
= P(-1.2<Z<.6)
= .7257-.1151
=.6106

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