Elementary Statistics need help ASAP
posted by Roxanne Singleton .
Measures of Central Tendency
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4. An MM207 statistics class surveyed 24 students to find out how many hours they spent doing homework during the previous week.
10 11 10 8 10 10 15 12 10 8 13 11
11 13 10 11 13 10 11 12 11 13 12 8
a. Calculate the mean for these data. (Round to 2 decimal places)
b. Determine the median for these data
Measures of Variation
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5. A placement test has a mean of 65 and a standard deviation of 2. A histogram of the data shows that the distribution is bell-shaped. Using the Empirical Rule, what two values have about 95% of the curve between them?
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A survey was conducted to measure the height of men. In the survey, respondents were grouped by age. In the 20 – 29 age groups, the heights were normally distributed, with a mean of 69.7 inches and a standard deviation of 3.0 inches. A study participant is randomly selected.
Find the probability that his height is less than 68 inches