A few days ago

Stats ?!! How do I find probabilty??? From sample :)?

A exam has a mean of 70 with a standard deviation of 7.1. What is the probablity that 20 students have a mean of less than 67?

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A few days ago

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Need further info:

1. How many are the total students?

2. Is this assuming normal distribution/bell curve?

Anyway.. You should check your distribution table. Usually attached at the back of your academic book as an appendix