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Historically,on Christmas day the weather in a certain Midwestern city has had the following distribution:
Event Relative Frequency
Clear & dry 0.20
Cloudy & dry 0.30
Rain 0.40
Snow 0.10
a- Based on these data, what is the probability that next Christmas will be dry?
b- Based on the data,what is the probability that next Christmas will be rainy or cloudy and dry?
c- Supposing next Christmas is dry, determine the probability that it will be also cloudy?
Suppose that you're the Quality Manager for the Emerson D. Meritz Machine Tool Company. Your model IE566 grinding machine is afflicted by three types of defects classified as major (type A), serious (type B) and minor (type C).
Find that the mean consumption of tea is 7.8 gallons per year with a standard deviation of 2.67 gallons.At α=0.07 can you support the society's claim?
A test statistic is a value determined from sample information used to reject or not reject the null hypothesis.All hypothesis testing is based on accepting or rejecting the alternative hypothesis.
A football team's season ticket sales, percentage of games won, and number of active alumni for the years 1992-2000 are given below:
Results are normally distributed with mean 200 and standard deviation 50. find probability that a single score will be less than 264.
Inventories represent a considerable investment for every organization; thus, it is important that they be managed well. Excess inventories can indicate poor financial and operational management.
Assume the standard deviation of the distribution is 2.5pounds, what is the probability that the mean of a sample of 55 families is between 17 and 18 pounds.
If campaign can be expected to also to rise the probability of best case scenario to 0.4, is it a good investment.
Out of 1000 respondents to a survey, 250 people planned to purchase a TV of which 200 actually purchased and 50 did not actually purchase. 750 people did not plan to purchase at TV, of which 100 actually purchased and 650 did not actually purchase.
A particular medical operation proves fatal in 1% of the cases. Find an approximation to the probability that there will be at least 2 fatalities in 200 operations.
A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
As an aid for improving students' study habit, nine students were randomly selected to attend a seminar on the importance of education in life. The table shows the number of hours each student studied per week before and after the seminar.
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