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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..
The average score on a Geography final examination was 70, with a stan..
The average score on a Geography final examination was 70, with a standard deviation of 5. The average score on an English final examination was 85 with a standard deviation of 8. Which class was more variable? => English or cannot be determined or both are e..
Jessica scored 70 in an Algebra test that had a mean of 60 and a stand..
Jessica scored 70 in an Algebra test that had a mean of 60 and a standard deviation of 8, and she scored 56 in French with a mean of 50 and a standard deviation of 5. Compare her relative positions in the two tests. => position in algebra is higher or positio..
A test on knowledge of word refinishing has a mean of 53 and a standar..
A test on knowledge of word refinishing has a mean of 53 and a standard deviation of 6. Smithy has been taking this test for the past six months and her score has a mean of 71 with a standard deviation of 9. Compare the two variabilities. => The average score..
The standard deviation of the hemoglobin values (g/100ml) of 10 childr..
The standard deviation of the hemoglobin values (g/100ml) of 10 children is 1.7. Find the 99% confidence interval for the variance and standard deviation. Assume that the variable is normally distributed. => 1.26 < σ 2 < 14.75 ; 1.12 < σ ..
What percentage of area (approximately) under the normal distribution ..
What percentage of area (approximately) under the normal distribution curve lies between a standard deviation of 1 and 2? => 15% or 13% or 27% or 30%..
30% of the people in a community went out on a vacation. If 600 people..
30% of the people in a community went out on a vacation. If 600 people are selected at random, then find the standard deviation of the number of people who went out on vacation. => 126 or 180 or 11.23 or 13.4..
Find the lowest control limit for a normally distributed curve with a ..
Find the lowest control limit for a normally distributed curve with a mean of 15 and a standard deviation of 2.5. => 12.5 or 10 or 7.5 or 22.5..
If the probability of a defective bolt is 0.05, then find the mean and..
If the probability of a defective bolt is 0.05, then find the mean and the standard deviation for the distribution of defective bolts in a total of 400. => 19, 2 0 or 20, 1 9 or 19, 20 or 20, 2 0..
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 standard error. => 1.15 or 0.8 or 8.0 or 1.0..
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