How many students will score less than 75?Ī biologist knows that the average length of a leaf of a certain plant is 4 inches. If the data set contains 40 data values, approximately how many of the data values will fall within the range of 6.5 to 13.5?ĥ000 students take an exam with a mean of 59 and a deviation of 8. The mean is 10 and the standard deviation is 3.5. If one starts assembling at 4 pm what is the probability that he will finish before the compĭecide by calculation how many candidates out of a total of 1000 candidates for the position of CEO meet the eligibility requirements for the desired performance of this top management position with at least 67% probability - provided, of course, that the The assembly time for the toy follows a normal distribution with a mean of 75 minutes and a standard deviation of 9 minutes. Assuming a normal distribution, how many women ran faster than Joan? There were 415 women who ran in her age group. Joan's finishing time for the bolder boulder 10 km race was 1.77 standard deviations faster than the women for her age group. Is there evidence to show that this group ha A random sample of 50 students were given the same test and showed an average score of 83.20. 4 Access time for secondary datĪ standardized test was administered to thousands of students with a mean score of 85 and a standard deviation of 8. 3 The most passive method of data collection is observation. The most frequent observation in a data set is known as the mode. Write TRUE OR FALSE for each question: 1 Standard deviation is a measure of central location.
a) What is the probability that a randomly selected light bulb will have a lifespan of more than 320 hours? b) Up to what value of L hours can the The lifetime of a light bulb is a random variable with a normal distribution of x = 300 hours, σ = 35 hours. What the range in minutes 68% of the batteries will last? What is the range in minutes approximately 99.7% of batteries will last? The life expectancy of batteries has a normal distribution with a mean of 350 minutes and standard deviation of 10 minutes. What are students in the bottom the 20% having what GPA? The average GPA is 2.78 with a standard deviation of 4.5.
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