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Since Mr. Smith assigns grades based on actual performances of students in the class, Mr. Smith's exams have an average score of 81 and standard deviation of 12. Some do not believe Mr. Smith and have decided to take an SRS of 40 students in Mr. Smith's class and ask their exam scores.
a) What is the probability that a single student's score will be less than 73?
b) What is the probability that the average score of the sample will be greater than 80 but less than 87?
If the office purchased 10,000 thermometer covers this year, what is the price variance - What should budgeted labor for the month be?
If the life of wild pheasants follows a normal distribution with a mean of 9 months and a variance of 9, what percent of the population will be less than 11 months of age?
The basic requirements needed to form a contract.
Use Hypothesis testing to compute te correlation between these two variables and these it for significance. Test at .01 level of significance.
I have two samples, one is 31.2% and one is 22.6%. I am trying to calculate the 95% confidence interval in context of this situation. ALso i need the formula that is used to calculate the interval and substitute appropiate numerical values into the f..
At a local college, of the 31 male students are smokers and 279 are non-smokers. Of the female students, are 40 smokers and 360 are non-smokers. A male student and a female student from the college are randomly selected for a survey. What is the ..
In a certain town, 30% of adults have a college degree. The accompanying table describes the probability distribution for the number of adults (among 4 randomly selected adults) who have a college degree. Find the standard deviation for the probab..
1. Cards are drawn one at a time, without replacement, from a deck of 52 cards until the first club card is obtained. Let X be the number of draws required. (a) Find the mass function of X .
A random sample of 16 federal inmates is selected. What is the probability that exactly 12 are serving time for drug dealing?
To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in.
Suppose the student does not walk to school. What is the probability that the student carries a lunch?- If the student buys lunch, how did he or she most likely get to school?
Heights of Presidents. With a height of 67 in., William McKinley was the shortest president of the past century. The presidents of the past century have a mean height of 71.5 in. and a standard deviation of 2.1 in.
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