Let X represent the amount of gasoline (gallons) purchased by a randomly selected customer at a gas station. Suppose that the mean value and standard deviation of X are 11.5 and 4.0, respectively. In a sample of 50 randomly selected customers, what is the approximate probability that the sample mean amount purchased is at least 13 gallons?

Q: Suppose that the distance of fly balls hit to the outfleld (in baseball) is normally distributed…

A: X follows a Normal distribution with mean = 257 and S.D = 44 Then z=(x-mean)/SD = (x-257)/44…

Q: the local college is included the mike run in a fitness test for seniors. suppose the time for this…

A: Given Information: Mean μ=469 seconds Standard deviation σ=50 seconds To find the probability that a…

Q: Suppose baby kittens' weights are normally distributed with a mean of 11.9 and a standard deviation…

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A: Finding the value of z at lowest 14-1.08032 ( From Excel =NORM.S.INV(0.14))Finding the value of z at…

Q: The average number of pounds of red meat a person consumes each year is 196 with a standard…

A: Answer Sample size [n] =50Mean =196Standard deviation =22

Q: Let x be a ramdom variable that represents the IQ score of an adult . Then x has a normal…

A: The z-score denotes how many standard deviations an individual score is away from the population…

Q: Assume thAt scores on a standardized test are known to follow a bell shaped distribution with a mean…

A: L

Q: Assume that a randomly selected subject is given a bone density test. Those test scores are normally…

A: Obtain the probability of a bone density test score greater than –1.52. The probability of a bone…

Q: he IQ is normally distributed with a mean of 100 and a standard deviation of 15. Suppose one…

A: Given that  Mean=100 SD=15 X = IQ of an individual. The probability that a randomly selected person…

Q: Suppose that a category of world class runners are known to run a marathon (26 miles) in an average…

A: X¯ ~ N(μx¯ , σx¯) μx¯=μ=142 σx¯=σn=1349=1.86 N = Normal distribution

Q: Let x be a ramdom variable that represents the temperatures, in degrees Farenheit, of an adult. Then…

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Q: In a certain state, two-fifths of all adults register as Democrats.  A random sample of 150 adults…

A: From the information, given thatLet the random variable X denotes the number of registered Democrats…

Q: During rush hour, the traffic speed on a busy highway is found to have mean 42 mph and standard…

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Q: The final exam scores in a statistics class were normally distributed with a mean of 63 and a…

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Q: Let x be a ramdom variable that represents the IQ score of an adult. Then x has a normal…

A: The mean of the data is 100. The standard deviation of the data is 25.

Q: normally distributed with a mean of $39,269 and a standard deviation of $2,550. The probability…

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Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A:

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A: The mean is 265 feet and a standard deviation is 45 feet.

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A: Given ,       Mean,μ =267standard deviation,σ=45using formula,Z-score = x-μσ

Q: In a large section of a statistics​ class, the points for the final exam are normally​ distributed,…

A: Finding the lowest score that would qualify a student for an A grade:The points for the final exam…

Q: The distribution of the number of transactions per day at a certain automated teller machine (ATM )…

A: Mean(µ) = 80Standard deviations (σ) = 10X ~ N (µ, σ )= N(80,10)

Q: In a large community, 44% of the people have blood type O. Let p be the proportion of people who…

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Q: Assume that a randomly selected subject is given a bone density test. Those test scores are normally…

A:

Q: Assume that a randomly selected subject is given a bone density test. Those test scores are normally…

A: From the given information, Test scores that is X is normally distributed woth mean 0 and standard…

Q: Most exhibition shows open in the morning and close in the late evening. A study of Saturday arrival…

A: From the provided information, Mean (µ) = 2 hours and 2 minutes or 122 minutes Standard deviation…

Q: The average salary for a certain profession is ​$80,000. Assume that the standard deviation of such…

A: We have to find correct answer..

Q: The lifetime risk of developing pancreatic cancer is about one in 78 (1.28%). Suppose we randomly…

A: As prof. N. G. Das said "Let there are n trials and each having two outcomes - Success and Failure.…

Q: Suppose that the number of points scored in a game comes from a normal population with an average of…

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Q: In a certain region, the mean annual salary for electricians is $58,650. Let x be a random variable…

A: According to the given information, we have Sample mean = 58650 Sample size = 50 Standard deviation…

Q: O A. 0.8615 OB. 0.8819 O C. 0.0062 OD. 0.9938

A: Let X be the random variable from normal distribution with mean (μ) = 124, standard deviation (σ) =…

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

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Q: The average score of all golfers for a particular course has a mean of 61 and a standard deviation…

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