Statistics and Probability Answers

What score can someone get one the exam to be exactly 2standard deviations above the mean?

u = 92, standard deviation = 4

Weights of women are normally distributed with mean 143 pounds and standard deviation 29 pounds. If 36 women are randomly selected, what is the probability that their mean weight is between 120 and 160 pounds?

a computer chip is manufactured such that every 200 chips ,10 are detective.if 20 chip are chosen at random from a nearly manufactured 200 chips. what is the probability that none of the chips will be detective?type

We have 20 jurors for atrial,12 favor punishment,8 don't favor punishment,if 12 jurors are selected at random from the 20 jurors,what is the probability that 7 of them will not favor punishment?

Find the minimum sample size you should use to assure that your estimate of P will be within the required margin of error around the population p. Margin of error: 0.02; confidence interval: 95%; from a prior study, P is estimated by the decimal equivalent of 57%

chebyshev's inequality

May has 31 days. How would the experimental probability be affected if someone mistakenly used 30 days to calculate the experimental probability that the maximum temperature will not be greater than 90ºF on a given day in May? (Hint: Select the correct reason with the correct calculation.)

over the last 10 years, the average number of deaths due to accidents involving a certain commercial airline has been about 30 per year. Over the same period, the average number of passengers of the airline has been more than 4.8 million per year. What is the probability of dying on a particular flight?

an automobile manufacturer claims that its van has a 26.3 miles/gallon rating. after testing 250 vans, they found a mean mpg of 26.7. assume a population variance of 6.76. a level of significance of 0.1 will be used. is there sufficient evidence at the 0.1 level that the vans have an incorrect manufacturers mpg rating.

The distribution of blood groups in a city is:
A : 41%; AB : 4%; B : 9%; O : 46%
An individual injured in a car accident is brought into an emergency room of
the hospital
i) What is the probability that the individual belong to blood-group type A
or B or AB?
ii) Describe the sample space and events in the above question.