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Professor Ivy has the following scores on her final exam: 81,74,97,84,93,77,66 68,73,90,71,78,64 Compute the values indicated below. Express your...

Professor Ivy has the following scores on her final exam:

81, 74, 97, 84, 93, 77, 66

68, 73, 90, 71, 78, 64

Compute the values indicated below. Express your answers rounded to the nearest tenth.

Mean: 78.2

Standard Deviation: 10.4

Use the 68-95-99.7 Rule to answer the following question. 

What is the probability of an exam score less than 47 ?  

Express your answer rounded to the nearest thousandth.

I have the answers for mean and standard deviation but i need help with the probability and a little more clarification on how to do it.

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