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In an attempt to find the mean number of hours his tutorial classmates spent per day preparing for tutorials, John collected data from 10 of his friends in the tutorial group and found that the mean is 2.4 hours with a standard deviation of 0.8 hours. However, a day later he felt that the sample size is too small. So he collected data from another 5 of his friends and found that the mean is 2.0 hours with a standard deviation of 1.2 hours. Find the mean and standard deviation when these 2 sets of data are combined.

Please help, thank you

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  • $\begingroup$ This seems like a homework question, what steps have you tried already and where do you get stuck? $\endgroup$
    – Oxbowerce
    Commented Aug 1, 2021 at 15:48
  • $\begingroup$ I hope following link will help you stats.stackexchange.com/questions/55999/… $\endgroup$ Commented Aug 2, 2021 at 6:28
  • $\begingroup$ thank you all, just got stuck in standard deviation things $\endgroup$
    – Lucifer
    Commented Aug 2, 2021 at 8:32

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