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junior college 1 | H1 Maths
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Hello, I’m stuck on this question. Any help would be much appreciated!
Date Posted: 3 years ago
Views: 559
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Sample mean = μ = 25
Sample standard deviation / standard error = σ / √n = 3/√20 ≈ 0.6708
P(sample mean of 20 students > 26.3 hours)
= 1 - P(sample mean of 20 students ≤ 26.3 hours)
= 1 - 0.973687442958 (you can use GC to do this if it's used in your course. I used an online stat calculator)
= 0.026312557042
≈ 0.0263
The closest is option 4.
Sample standard deviation / standard error = σ / √n = 3/√20 ≈ 0.6708
P(sample mean of 20 students > 26.3 hours)
= 1 - P(sample mean of 20 students ≤ 26.3 hours)
= 1 - 0.973687442958 (you can use GC to do this if it's used in your course. I used an online stat calculator)
= 0.026312557042
≈ 0.0263
The closest is option 4.
Please note that for ' sample standard deviation/standard error' , the / is used in the context of 'or' and not ' divided by'
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