Based on long-term investigation, researchers suggest that the acidity (pH) of rainfall/storms in a given mountain can be described by the normal model N(4.9,0.6) what percent of storms produced rainfall with ph over 6?

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Based on long-term investigation, researchers suggest that the acidity (pH) of rainfall/storms in a given mountain can be described by the normal model N(4.9,0.6)

what percent of storms produced rainfall with ph over 6? 

the lower the ph the more acidic the rain. What is the ph level for the most acidic 20% of all storms? 

what is the OQR for the ph of rainfall? Use the meaning of OQR in context with the normal curve to answer this question. 

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