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# Stats question help watch

1. Can anyone explain how to do part b? I am confuzzled

Thanks

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2. (Original post by jessyjellytot14)

Can anyone explain how to do part b? I am confuzzled

Thanks

Posted from TSR Mobile
How can you calculate the total amount of minutes in 80 weeks? How does this help?
3. (Original post by SeanFM)
How can you calculate the total amount of minutes in 80 weeks? How does this help?
Idk and I'm not sure what the question is asking me to do cause its already said the mean is 21

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4. (Original post by jessyjellytot14)
Idk and I'm not sure what the question is asking me to do cause its already said the mean is 21

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The 80 weeks is made up of two blocks. The 55 week period, where you already know the mean / total, and the 25 week period, where you don't know the mean/total. Add that together and you get 80 weeks, which you do know the mean and you can calculate the total. So if you want to get the number of minutes in 25 weeks what do you do?
5. (Original post by SeanFM)
The 80 weeks is made up of two blocks. The 55 week period, where you already know the mean / total, and the 25 week period, where you don't know the mean/total. Add that together and you get 80 weeks, which you do know the mean and you can calculate the total. So if you want to get the number of minutes in 25 weeks what do you do?
I have a vague idea but im not sure how i'd go about it.. Would i have to set up an equation and solve for x?

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6. (Original post by jessyjellytot14)
I have a vague idea but im not sure how i'd go about it.. Would i have to set up an equation and solve for x?

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Explain why/how you'll do that.
7. (Original post by SeanFM)
Explain why/how you'll do that.
Its probably not the most logical method haha but i was thinking of doing 1060 + x all divided by 80 and make that equal to 21...

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8. (Original post by jessyjellytot14)
Its probably not the most logical method haha but i was thinking of doing 1060 + x all divided by 80 and make that equal to 21...

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Well done, that is the correct/logical method. Now you just have to remember what x actually is and how you get to the final answer from x.
9. (Original post by SeanFM)
Explain why/how you'll do that.
I got x=620 and then i divided by 25 to get 24.8 as the mean time. Is that right?

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10. (Original post by jessyjellytot14)
I got x=620 and then i divided by 25 to get 24.8 as the mean time. Is that right?

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Yes, well done

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Updated: October 21, 2015
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