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# Mathswatch watch

1. I do not understand this MathsWatch question, can someone explain to me how to do it?Attachment 699300
2. (Original post by Piiii)
I do not understand this MathsWatch question, can someone explain to me how to do it?Attachment 699300
It is a 10% sample, stratified by time. This means 10% of the people from each class width for time get selected to be in the sample. Round the numbers for people in the sample to an integer - you cannot have 1/2 a person!

10% of 7 = 0.1 x 7 = 0.7 (Rounded up to 1)
10% of 22 = 0.1 x 22 = 2.2 (Rounded down to 2)

If you continue like that you should get the correct answers.

Here's a completed similar practise question from my MathsWatch account to help
3. (Original post by Loci Pi)
It is a 10% sample, stratified by time. This means 10% of the people from each class width for time get selected to be in the sample. Round the numbers for people in the sample to an integer - you cannot have 1/2 a person!

10% of 7 = 0.1 x 7 = 0.7 (Rounded up to 1)
10% of 22 = 0.1 x 22 = 2.2 (Rounded down to 2)

If you continue like that you should get the correct answers.

Here's a completed similar practise question from my MathsWatch account to help
Thank you!!!
4. (Original post by Piiii)
Thank you!!!
No problem

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