Americans receive an average of 15 Christmas cards each year. Suppose the number of Christmas cards is normally distributed with a standard deviation of 7. Let X be the number of Christmas cards received by a randomly selected American. Round all answers to 4 decimal places where possible.

Q: The 6 participants in a 200-meter dash had the following finishing times (in seconds). 24, 30, 26,…

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Q: A given set of data has a specific standard deviation. Describe what will happen to the standard…

A: Standard deviation: it evaluate that how numbers are speared out in data, denoted by s. s= ∑xi-x2n…

Q: Find the standard deviation of the data set. (Do not round until the final answer. Round final…

A: Given Data : Ages of Last 6 Presidents at InaugurationGeorge Bush 64Bill Clinton 46George W. Bush…

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

Q: The mean and standard deviation of players' heights for the 2003 NBA season were H 79.5 inches and o…

A: A z-score (also called a normal score) gives an indication of how far from the mean a data point is.

Q: Need asap   For a medical study, a researcher wishes to select people in the middle 75% of the…

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Q: Assume that the readings on the thermometers are normally distributed with a mean of 0° and standard…

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Q: Cars on I-40 have a mean speed of 73 MPH at a certain mile marker, with a standard deviation of 8…

A: Let X = speed of the car. X~N73, 82 To calculate P[70<X<75]. So,…

Q: sume that the readings on the themometers are normally distributed with a mean of 0" and standard…

A: We have find givan normal distribution...

Q: 8. Toastmasters International cites a report by Gallop Poll that 40% of Americans fear public…

A: As per the guidelines we are allowed to solve maximum of 1 question. If you need help with another…

Q: A student takes an exam containing 3 true or false questions. If a student randomly guesses on the…

A: The provided information is as follows:The total number of true or false questions is

Q: The Transport Network Vehicle Service (TNVS) drivers have an average booking of 22 rides a day with…

A: Here we have given the information, using this information we have to find the standard error of the…

Q: Below represents the amounts that a random sample of employees reported that they spent on dinner…

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Q: Write out the formula of the standard deviation of a variable called X in a population. Be sure to…

A: 1.  Write out the formula of the standard deviation of a variable called X in a population. Be sure…

Q: Scores on a test have a mean of 6 and a standard deviation of 9. Michelle has a score of 57. Convert…

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Q: Jone works for a Italian dramatic agency whose workers had an average income this past year of…

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Q: Sophia's final exams have an average of 78 and a standard deviation of 6. If she wants 4% of her…

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Q: Convert score 46 to z-score if the mean is 40 and the standard deviation is 4.

A: The definition of a z-score is:   z = (X - μ) / σ

Q: The weights of steers in a herd are distributed normally. The standard deviation is 200lbs. and the…

A: Let "X" be the weight of steers in a herd.

Q: The accompanying data represent the pulse rates (beats per minute) of nine students. Treat the nine…

A: Given, Student Pulse 1 76 2 60 3 60 4 80 5 73 6 80 7 80 8 68 9 73

Q: Adult men have an average height of 69.0 inches with a standard deviation of 2.8 inches. Find the…

A: The objective of this question is to find the height of a man given the z-score, the average height,…

Q: A Food Marketing Institute found that 28% of households spend more than $125 a week on groceries.…

A: given data  p (spend more than $125) = p = 0.28 n = 235 P(p^<0.31) = ?

Q: The time spent waiting in the line is approximately normally distributed. The mean waiting time is 5…

A: given data,normal distribution μ=5σ=3probability that person will wait more than 9 minutes =?

Q: The average THC content of marijuana sold on the street is 10.8%. Suppose the THC content is…

A: Given, mean= 10.8  Standard deviation= 1 So, variance= 12=1 So, X~N(mean,variance)= N(10.8,1)…

Q: The heights of adult women are normally distributed with a mean of 64.5 inches and a standard…

A: The question is about normal distributionGiven :Mean height of adult women (  ) = 64.5…

Q: Pattys final exams have an average of 78 and a standard deviation of 6.  If she wants 4% of her…

A: X follows a Normal distribution with mean = 78 and S.D = 6 Then z=(x-mean)/SD = (x-78)/6  follows…

Q: For a certain group of individuals, the average heart rate is 74 beats per minute. Assume the…

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Q: Find the indicated probability. The incomes of trainees at tthe local mill are normally distributed…

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Q: How do I do this problem?

A: Solution: Let X be the IQ score. From the given information, X follows normal distribution with mean…

Q: The distances golf balls travel under laboratory testing conditions are normally distributed. The…

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Q: Assume that adults have IQ scores that are nomally distributed with a mean of u= 100 and a standard…

A: It is given that the mean is 100 and standard deviation is 15.

Q: Find the standard deviation of the following -14, -4,-10, -12, 5, -1.

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Q: Max scored an 80 on her psychology quiz, but the class as a whole averaged a 40. If the standard…

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Q: Round each z-score to the nearest hundredth. A data set has a mean of  x = 213  and a standard…

A: For a sample point x, the corresponding z-score is given by    z = (x - )/ Where,  = mean of the…

Q: On a multiple choice test with 10 questions, each question has four possible answers, one of which…

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Q: percentile rank on each exam? Percentile rank of ACT  Percentile rank of SAT  On which exam did…

A: The mean and standard deviation for the ACT are 18 and 7. Carla scored 31 on her ACT. The value of…

Q: Cars on I-40 have a mean speed of 73 MPH at a certain mile marker, with a standard deviation of 8…

A: Given data,μ=73σ=8P(X>78)=?

Q: A final exam in Seaturtle Research Studies has a mean of 78 and a standard deviation of 3. If 36…

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Q: All 6 members of a family work. Their hourly wages (in dollars) are the following. 37, 28, 16, 24,…

A: 37,28,16,24,10,11