mean deviation

In an aptitude test conducted to qualify for a job, the scores given were normally distributed with a mean of 75 and a standard deviation 8. If only top 15% were to be selected, then find the cut - off scores. => 83.8 or 88.3 or 83.3 or 85..

Two cloth stores design 15 new types of shirts for every three months to attract the customers. The mean number of shirts designed in the first cloth store was 12, with a standard deviation of 4. The mean number of shirts designed in the second cloth store was 20 with ..

An organization conducted a test for a group of students, whose scores are normally distributed with mean 70 and standard deviation 3. Find the probability that the score of a particular student is greater than 67. => 0.8413 or 0.1587 or 0.3413 or 0.5000..

Scores in statistics obtained by students of a class are normally distributed. If 12.5% obtain 60% scores and above and 39% less than 30, then find the mean and the standard deviation of the scores. => 36.55, 20.98 or 35.89, 28.90 or 39.85, 29.80 or 35.88, 20.98..

10% of students in a school are left-handed. If 350 students are selected at random, then find the mean, variance, and standard deviation of the number of students who are left-handed. => 40, 36, 6 or 5.61, 31.5, 35 or 35, 31.5, 5.61 or 31.5, 35, 5.61..

The mean score on a standardized test is 100 with a standard deviation of 8. A random sample of 48 scores was found to have a mean of 98. Test at the 0.05 level of confidence and state whether or not to accept the null hypothesis. => The null hypothesis is accepted or ..

The mean number of males and females in 40 classrooms of a school are 25 and 22 with the standard deviations 12.2 and 15.6 respectively. Do the mean values differ at 98% and 95% confidence levels? => do not differ at 95% and also at 98% or do not differ at 98%, differ ..

Which of the following controls the spread of normal curve? I. standard deviation II. mean III. median IV. mode => III and IV only or II only or III only or I only..

The scores on a certain standardized test are known to have a mean of 100 and standard deviation 25. A person will get a merit certificate if he scores above 125. What is the probability that a person taking this test receives a merit certificate? => 0.1587 or 0.6587 or 0.3413 o..

Five thousand candidates appeared for an examination, which carried a maximum of 100 points. These points were found to be normally distributed with mean 39.5 and standard deviation 12.5. Determine approximately the number of candidates who secured more than 60 points. => 121 or..