Heights of women in a population
Suppose heights of women in a population follow normal curve with mean 64.3 in. and standard deviation 2.6
a) A certain woman has a height 0.5 standard deviations above the mean. What proportion of woman are taller than she is?
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The life span at birth of humans has mean of 88.71 years and standard deviation of 18.69 years. Compute the upper and lower bounds of an interval containing 95% of the sample mean life spans at birth based on samples of 145 people.
A consumer organization determines that over a 1-year period 20% of cars will need to be repaired once, 10% will need to be repaired twice, and 5% will require three or more repairs. Determine the probability that a car selected at random will nee
An insurance salesperson is capable to sell policies to 15% of the people she contacts. Assume she contacts 120 people throughout a 2- week period. Determine the probability that she sells more than 20 policies?
Determine the probability that someone that traveled to Mexico has visited Canada too? Are travel to Canada and Mexico independent events? Explain.
Discuss why this probability is equal to the probability that the set of withdrawn balls always contains more white than black balls.
The wait time at the popular fast food restaurant is uniformly distributed between 2 and 10 minutes upon average. Determine the probability that you wait less than 4 minutes. Determine the probability that you wait between 8 and 10 minutes.
The Central Intelligence Agency has specialists who examine the frequencies of letters of the alphabet in an attempt to decipher intercepted messages. In standard English text, the letter r is used at a rate of 4.9%.
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