Elementary Statistics need help ASAP

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Measures of Central Tendency
Be sure to show your work so that partial credit may be awarded.

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

  • Elementary Statistics need help ASAP -

    Measures of Variation

    Be sure to show your work

    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?

  • Elementary Statistics need help ASAP -

    Here are tutorials to help you:

    http://www.google.com/search?q=Measures+of+Central+Tendency+tutorial&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

    Sra

  • Elementary Statistics need help ASAP -

    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

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