Suppose a marine scientist is measuring salinity levels of sea water samples from the atlantic ocean. Suppose the salinity values have a normal distribution with a mean of 35 "parts per mil" and a standard deviation of 2 "parts per mil" about what percentage of salinity measurements will be between 31 and 39 parts per mil?
a) 99.7
b) 95
b) 47.5
d) 68
Answer: b) 95
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