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Let x be a random variable that represents the monthly electric bills in a certain city. Data shows that x is approximately normally distributed with a mean of $240 and a standard deviation of $45. What is the probability that a randomly selected electric bill is greater than $300?
A chocolate bar is considered underweight if it weights less than 8.0 oz. How should the chocolate bar wrappers be labeled so that only 1% of such bars are underweight.
1 an engineer is going to redesign an ejection seat for an airplane. the seat was designed by pilots weighing between
A researcher measures a response variable Y and explanatory variable X on each of several objects. A scatterplot of the measurements is as follows.
Calculate the sample correlation coefficient by hand. By use of a spreadsheet calculate the sample correlation coefficient.
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
The condition for the question is that the deck of cards has 52 cards and among them are 12 face cards. What is the probability of choosing 6 face cards out of 8 chosen. Thru Binomial distribution holds( meaning with replacement)
You own a Pepsi bottling plant, and you are concerned about filling the bottles to the correct level. Should you conduct a one-tailed or two-tailed hypothesis test? Explain.
The average height of american woman is distributed normally, with a mean of 63.5 inches and a standard deviation 2.5 inches. Approximately what percentage of american women are taller than 58.5 inches,
Why might supposition of normal population be doubtful? Problem arises when?
Favor of gun control legislation. Find the point estimate for estimating the proportion of all Americans who are in favor of gun control legislation.
What is the probability that the person thinks that "Made in America" ads boost sales and uses social media online?
A coin is flipped e times and heads (h) or tails (t) are recorded:
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