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What proportion of subjects take longer than 30 seconds

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Reference no: EM132201220

The reaction time to a certain psychological experiment is considered to be normally distributed with a mean of 20 seconds and a standard deviation of 4 seconds.

(i) What proportion of subjects take longer than 30 seconds to react?

(ii) What is the reaction time such that only 10% of subjects are faster than this time?

Reference no: EM132201220

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