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Find the mean, variance and standard deviation for the number of heads..
Find the mean, variance and standard deviation for the number of heads, when 20 coins are tossed. => 10, 5, 5 or 5, 5 2 , 5 2 or 10, 5 , 5 or 5, 5 2 , 5 2..
A survey asks 'How much time do you spend in front of the TV in one we..
A survey asks 'How much time do you spend in front of the TV in one week? Suppose the responses are normally distributed, the mean is 10 hours and the standard deviation is 2 hours. What value in hours is one standard deviation above the mean, and one st..
The average age of technicians at B & T company is 26 years, with a s..
The average age of technicians at B & T company is 26 years, with a standard deviation of 6 years. The average salary of the technicians is $31,000 with a standard deviation of $4000. Is the variation in the salary of technicians more than the variation in th..
For a group of 200 candidates, the mean and standard deviation of scor..
For a group of 200 candidates, the mean and standard deviation of scores were found to be 40 and 15. Later on, it was discovered that the scores 43 and 35 were misread as 34 and 53. Find the corrected mean and standard deviation. => 39.955 and 14.97 or 31 and..
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 be..
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. Find the 95% confidence interval. => The interval is between 97.75 and 102.25 or The interval is between 1.15 and 100 or The interv..
What is the approximate area under the part of the normal curve that l..
What is the approximate area under the part of the normal curve that lies within 1 standard deviation of the mean? => 33.3% or 68% or 95% or 99.7%..
Find the highest control limit for a normally distributed curve with a..
Find the highest control limit for a normally distributed curve with a mean of 20 and a standard deviation of 3. => 23 or 29 or 11 or 26..
If 5% of truck carburetors are defective, then find the mean and stand..
If 5% of truck carburetors are defective, then find the mean and standard deviation of a lot of 400 carburetors. => 20, 4.36 or 4.36, 20 or 19, 4.36 or 20, 19..
If 20% of the computer chips are defective, then find the variance and..
If 20% of the computer chips are defective, then find the variance and standard deviation of a lot of 542 chips. => 86.72, 9.31 or 433.6, 108.4 or 108.4, 86.72 or 9.31, 86.72..
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