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In a certain pediatric population, systolic blood pressure is normally distributed with mean 115 mm Hg and standard deviation 10 mm Hg. Find the probability that a randomly selected child from this population will have:
(a) A systolic pressure greater than 125 mm Hg.
(b) A systolic pressure less than 95 mm Hg.
(c) A systolic pressure below which 95% of this population lies.
(d) Interpret (a), (b), and (c).
joint pmf p(X1,X2)=(X1+2X2)/18, (x1,x2)=(1,1),(1,2),(2,1),(2,2), zero elsewhere. Determine the conditional mean and variance of X2, given X1=x1, for x1=1 or 2. Also compute E(3X1-2X2).
Find the mean and the median of the number of items. Find the range and the standard deviation of the number of items.
Find the probability that the average of those counts is more than 81.4 mosquitos per square meter. Assume that the variable is normally distributed.
A survey of 608 adults showed that 401 of them approved of the way city government was being run. Find a 99% confidence interval for the true proportion of voters who approve the way city government is being run.
the city of lewisville has 65246 adults of which 33064 are men. a simple random sample of size 1000 is taken of this
The number of Mongolian words students learn per class is distributed as Poisson with mean 2. After 10 classes, what is the probability that they learned more that 25 words given that they learned at least 20 words
Suppose a consumer group suspects that the proportion of households that have three cell phones is 30%. A cell phone company has reason to believe that the proportion is 30%. Before they start a big advertising campaign, they conduct a hypothesis ..
A packaging company distributes quarter-pound beef patties to local fast-food restaurants. The restaurants demand the weights to be 4 plus or minus .02 ounces.
according to the insurance institute of america a family of four spends between 400 and 3800.00 per year on all types
Why are the utilization statistics different across the different generating sources? What percent of total electric sales (in GWh) is nonresidential? Why are operating statistics like this useful to analysts?
Now we are going to talk about continuous probability distributions. In a continuous probability distribution, the variable can have a value within a range.
Then you travel the same distance to another point C moving at a constant speed of 120 km/h. Your average speed for the entire trip from A to C is?
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