Statistics

posted by .

If mean of 1, 2, 3, --------- n is 6n/11, then n is

  • Statistics -

    The sum of a series of integers (1,2,3.. n)is

    n(n+1)/2

    so the mean is the total/n, hence

    n(n+1)/2n
    =6n/11

    solve for n

    I got n=11

  • Statistics -

    Thank you

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. statistics

    A statistics practitioner formulated the following hypothesis: Ho: population mean=200 H1: population mean<200 sample mean=190 n=9 population standard deviation=50 Calculate the p-value of the test
  2. Statistics

    If Y' = a +bX for all i and a=the mean of Y - b*the mean of X, prove that SigmaY' = SigmaY (subscript i). Hint: replace a with mean of Y minus b*mean of X and take the sum of both sides of the equation--that is, SigmaY'(subscript i)=Sigma(mean …
  3. statistics

    If μ =10 and σ =4 for a distribution of sample mean, with n=16 for each mean, how far above the population mean (in %) is a sample mean score of 12
  4. Statistics

    2. Obtain and interpret descriptive statistics (Mean, Median, Variance, and Std. Dev.). Include the STATA outputs in your results. (Use Stat command “tabstat crimerat police59, statistics(mean, p50, var, sd)” (3 pts) . tabstat …
  5. statistics

    a final exam in statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than …
  6. statistics

    18 workers at a large assembly plant were asked the time it took to commute to work. The data was analyzed in Minitab and the Descriptive Statistics for the data appears below. Descriptive Statistics: Minutes Variable N Mean Median …
  7. statistics

    7) A final exam in Statistics has a mean of 73 with a standard deviation of 7.73. Assume that a random sample of 24 students is selected and the mean test score of the sample is computed. What percentage of sample means are less than …
  8. Statistics

    An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with …
  9. statistics/ mean median mode

    1. What two aspects of the data determine which measure of central tendency to use?
  10. Statistics

    Salaries of 50 college graduates who took a statistics course in college have a​ mean, x of $68,200. Assuming a standard​ deviation, σ​, of $12,279​, construct a 95% confidence interval for estimating the population mean μ.

More Similar Questions