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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%..
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..
A machine produces bolts, of which 10% are defective. Find the probabi..
A machine produces bolts, of which 10% are defective. Find the probability that in a random sample of 400 bolts produced by the machine, between 35 and 45 will be defective. Assume a standard deviation of 6. => 0.5640 or 0.6405 or 0.4605 or 0.4560..
The average price of a bicycle is $300. The prices of the bicycles are..
The average price of a bicycle is $300. The prices of the bicycles are normally distributed with a standard deviation of $60. What is the probability that a randomly selected bicycle costs more than $450? => 0.62% or 6.2% or 3.8% or 0.38%..
The number of stamps of different countries collected by Edward are 96..
The number of stamps of different countries collected by Edward are 96, 98, 98, 105, 36, 87, 95 and 93. Find the mean and the standard deviation. => 416.25, 20.4 or 88.5, 20.4 or 20.4, 5.77 or 20.4, 4.51..
The mean score on a standardized test is 100 with a standard deviation..
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. State the null hypothesis and alternative hypothesis. => H o : The mean score = 100, H a : The mean score ≠ 100 or H o : The mean score = 8, H a : T..
In a report, the standard deviation of the weights of male student ath..
In a report, the standard deviation of the weights of male student athletes is stated as 2 pounds. The standard deviation of weight of a random sample of 24 male student athletes was found as 1.9 pounds. Find the chi-square test value. At α = 0.01 is there enough evidence ..
In a survey conducted, 4 out of every 7 people play computer games. If..
In a survey conducted, 4 out of every 7 people play computer games. If 147 people are selected at random, then find the standard deviation of the number of people playing computer games. => 36 or 63 or 6 or 84..
Which of the following controls the spread of normal curve?I. standard..
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..
A standard notebook is supposed to have on an average, 200 pages, with..
A standard notebook is supposed to have on an average, 200 pages, with a standard deviation of 2 pages. From a supply of 2500 notebooks, a random sample of 40 notebooks was taken and found that the mean number of pages in the notebook was 197. Determine the standard error. => 6.33 or 2 or..
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