
The marks obtained by the students at an examination are found to be normally distributed with...
The marks obtained in statistics in a certain examination are found to be normally distributed. If 15% of the candidates got greater than or equal 80 marks and 40% of candidates got less than 50 marks, find the mean and standard deviation of marks.
The marks obtained by students from previous classes are normally distribution with a mean of 75 and a standard deviation of 10. the probability that a student is having a mark between 70 and 90 in this distribution? how many students will fail in Statistics if the passing mark is 65 for a class of 100 students?
The IQ scores of college students are normally distributed with the mean of 120 and standard deviation of 10. If a random sample of 25 students is taken, what is the probability that the mean of this sample will be between 120 and 125. (49.38%)
In a university final examination, the scores of students are normally distributed. The examination is scaled so that the Mean is 72 and the Standard Deviation is 18. What fraction of the students throughout the university should score between 72 and 99? Group of answer choices
The marks obtained by a number of students in a certain subject are assumed to be approximately normally distribution with mean 55 and a S.D of 5. If 5 students are taken at random from this set, what is the probability that three of them would have scored marks above 60?
The marks of 800 candidates in an examination were normally distributed with a mean of 45 marks and standard deviation of 20 marks. If 5% of the candidates obtained a distinction by scoring X marks or more, estimate the value of X ; [4 Marks] Estimate the interquartile range of the marks. [6 Marks]
A set of final examination grades in a calculus course was found to be normally distributed with a mean of 69 and a standard deviation of 8. Only 5% of the students taking the test scored higher than what grade? (Ch 6) answer is 83.81 but please show and explain how, what z table you used and the numbers. thanks
A set of final examination grades in a calculus course wasfound to be normally distributed with a mean of 69 and a standarddeviation of 9. a. what is the probality of getting a grade of 91or less on this exam? b. What percentage of students scored between 65 and89? c. What percentage of students scored between 81 and89? d. Only 5% of the students taking the test scored higherthan what grade?
The exam scores on a certain Society of Actuaries (SOA)
professional examination are Normally distributed with a mean score
of μ=67% and a standard deviation of σ=5%.
(1 point) The exam scores on a certain Society of Actuaries (SOA) professonal examination are Normally distributed with a mean score of u = 67% and a standard deviation of o= 5%. (a) What is the probability that a random chosen person who is writing this SOA exam will score at most 69%?...
It is known that IQ of students at a certain elementary school is normally distributed with mean μ = 100 and standard deviation σ = 16. Calculate the probability that in a random sample of n = 4 students the observed sample mean is within 10 units of the true population mean. Answer to four decimal places.