900 Secondary School Students Are Selected Randomly from Across the Country

question 16

Multiple Choice

900 secondary school students are selected randomly from across the country because they have achieved 10 GCSEs at grade A -C.There is a standard deviation of 0.4.Assuming a 95% confidence rate,what is the margin of error?

• A)0.011
• B)0.025
• C)0.178
• D)0.555

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