The final exam grade of a statistics class has a skewed distribution with mean of 76...
The final exam grade of a statistics class has a skewed distribution with mean of 76 and standard deviation of 7.4. If a random sample of 36 students selected from this class, then what is the probability that the average final exam grade of this sample is between 75 and 80? Answer: (keep 4 decimal places)
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The final exam grade of a statistics class has a skewed
distribution with mean of 76...
The final exam grade of a statistics class has a normal distribution with mean of 75.5...
The final exam grade of a statistics class has a normal distribution with mean of 75.5 and standard deviation of 7. Find the two cutoff values which separate the middle 20% of final exam grades in this class. Lower cutoff is (keep 1 decimal place) Upper cutoff is (keep 1 decimal place)
The average grade in a statistics course has been 76 with a standard deviation of 11....
The average grade in a statistics course has been 76 with a standard deviation of 11. If a random sample of 56 is selected from this population, what is the probability that the average grade is more than 80? Use Appendix B.1 for the z-values. (Round your z-value to 2 decimal places and the final answer to 4 decimal places.) Probability
7) A retired statistics professor has recorded final exam results for decades. The mean final exam...
7) A retired statistics professor has recorded final exam results for decades. The mean final exam score for the population of her students is 82.4 with a standard deviation of 6.5 . In the last year, her standard deviation seems to have changed. She bases this on a random sample of 25 students whose final exam scores had a mean of 80 with a standard deviation of 4.2 . Test the professor's claim that the current standard deviation is different...
The overall grade of a statistics class has a normal distribution with mean of 85.5 and...
The overall grade of a statistics class has a normal distribution with mean of 85.5 and standard deviation of 5.5. The instructor decides letter grades of students so that 5% fails the class. Find the minimum overall grade a student should get so that the student does not fail the class. (keep 1 decimal place)
The average final exam score for the statistics course is 76%. A professor wants to see...
The average final exam score for the statistics course is 76%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is different. The final exam scores for the 13 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 74, 88, 68,95, 84, 83, 70, 97, 66, 82, 67, 67, 86 What can be...
The professor of a introductory calculus class has stated that, historically, the distribution of final exam...
The professor of a
introductory calculus class has stated that, historically, the
distribution of final exam grades in the course resemble a Normal
distribution with a mean final exam mark of μ=63μ=63% and a
standard deviation of σ=9σ=9%.
If using/finding zz-values, use three decimals.
(a) What is the probability that a random chosen
final exam mark in this course will be at least 73%? Answer to four
decimals.
(b) In order to pass this course, a student must
have a...
The distribution of scores for the 1,000 final exams in a statistics course has a population...
The distribution of scores for the 1,000 final exams in a statistics course has a population mean of 74 and a population standard deviation of 15. A random sample of 36 exam papers is selected. What is the probability that the sample mean is higher than 77? (a) 0.1100 (b) 0.2151 (c) 1131 (d)1151
The amounts of electricity bills for all households in a city have a skewed probability distribution...
The amounts of electricity bills for all households in a city have a skewed probability distribution with a mean of $145 and a standard deviation of $36. Find the probability that the mean amount of electric bills for a random sample of 75 households selected from this city will be between $137 and $150. Round your answer to four decimal places.
In a statistics class, the average grade on the final examination was 75 with a standard...
In a statistics class, the average grade on the final examination was 75 with a standard deviation of 5. a. At least what percentage of the students received grades between 50 and 100? Determine an interval for the grades that will be true for at least 70% of the students. b.
point) The professor of a Introductory Calculus class has stated that, historically, the distribution of final...
point) The professor of a Introductory Calculus class has stated that, historically, the distribution of final exam grades in the course resemble a Normal distribution with a mean final exam mark of 63% and a standard deviation of = 11% using/Tinding z-values, use three decimals (a) What is the probability that a random chosen final exam mark in this course will be at least 75%7 Answer to four decimals. 0.1378 a) in order to pass this course, a student must...
The average final exam score for the statistics course is 76%. A professor wants to see if the average final exam score for students who are given colored pens on the first day of class is different. The final exam scores for the 13 randomly selected students who were given the colored pens are shown below. Assume that the distribution of the population is normal. 74, 88, 68,95, 84, 83, 70, 97, 66, 82, 67, 67, 86 What can be...
The professor of a
introductory calculus class has stated that, historically, the
distribution of final exam grades in the course resemble a Normal
distribution with a mean final exam mark of μ=63μ=63% and a
standard deviation of σ=9σ=9%.
If using/finding zz-values, use three decimals.
(a) What is the probability that a random chosen
final exam mark in this course will be at least 73%? Answer to four
decimals.
(b) In order to pass this course, a student must
have a...
The amounts of electricity bills for all households in a city have a skewed probability distribution with a mean of $145 and a standard deviation of $36. Find the probability that the mean amount of electric bills for a random sample of 75 households selected from this city will be between $137 and $150. Round your answer to four decimal places.
In a statistics class, the average grade on the final examination was 75 with a standard deviation of 5. a. At least what percentage of the students received grades between 50 and 100? Determine an interval for the grades that will be true for at least 70% of the students. b.
point) The professor of a Introductory Calculus class has stated that, historically, the distribution of final exam grades in the course resemble a Normal distribution with a mean final exam mark of 63% and a standard deviation of = 11% using/Tinding z-values, use three decimals (a) What is the probability that a random chosen final exam mark in this course will be at least 75%7 Answer to four decimals. 0.1378 a) in order to pass this course, a student must...
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