To qualify in a competitive examination, candidates must score in the ..
To qualify in a competitive examination, candidates must score in the top 5% in the examination. The test has a mean of 200 and a standard deviation of 20. What is the lowest possible score to qualify? Assume the test scores are normally distributed. => 202.6..
The scores made by candidates in a certain test are normally distribut..
The scores made by candidates in a certain test are normally distributed with mean 500 and standard deviation 100. What percentage of candidates received scores greater than 700? => 2.28% or 2.82% or 47.72% or 47.27%..
The scores made by candidates in a certain test are normally distribut..
The scores made by candidates in a certain test are normally distributed with mean of 500 and standard deviation of 100. What percentage of candidates received scores between 400 and 700? => 88.15% or 81.85% or 88.51% or 85.81%..
Mr. John gave his students a test in the class. The scores were normal..
Mr. John gave his students a test in the class. The scores were normally distributed with a mean of 75 and standard deviation of 4. What percent of the students scored between 71 and 79? => 95% or 99.7% or 68% or 34%..
In an aptitude test conducted to qualify for a job, the scores given w..
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..
An organization conducted a test for a group of students, whose scores..
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..
When can the normal distribution be used as an approximation to the bi..
When can the normal distribution be used as an approximation to the binomial distribution? => n . p = 5, n . q = 5 or n . p ≤ 5, n . q ≤ 5 or n . p > 5, n . q < 5 or n . p ≥ 5, n . q ≥ 5..
The standard deviation of carbohydrates in a random sample of 15 diffe..
The standard deviation of carbohydrates in a random sample of 15 different kinds of 4 oz patty sandwitches is 5.4 grams. At α = 0.01, test the hypothesis that the standard deviation is greater than 4.8 grams. What is the chi-square test value? [Assume that the variable is ..
A sample of 30 RAM chips was tested for the average access time. The s..
A sample of 30 RAM chips was tested for the average access time. The standard deviation was found to be 2 nanosec. Find the 90% confidence interval for the true standard deviation. Assume that the variable is normally distributed. => between 1.7 and 2.6 or between 1.6 ..
How many modes does a normal distribution curve have?
How many modes does a normal distribution curve have? => zero or more than two or one or two..
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