In the article “Occurrence and Distribution of Ammonium in Iowa Groundwater”, ammonium concentrations (in mg/L) were measured at a total of 349 alluvial wells in the state of Iowa. The mean concentration was 0.27, the median was 0.10, and the standard deviation was 0.40. If a histogram of these 349 measurements were drawn,
In the article “Occurrence and Distribution of Ammonium in Iowa Groundwater”, ammonium concentrations (in mg/L) were measured at a total of 349 alluvial wells in the state of Iowa. The mean concentration was 0.27, the median was 0.10, and the standard deviation was 0.40. If a histogram of these 349 measurements were drawn,
a. it would be skewed to the right.
b. it would be skewed to the left.
c. it would be approximately symmetric.
d. its shape could not be determined without knowing the relative frequencies.
a. It would be skewed to the right. The mean is greater than the median. Also note that half the values are between 0 and 0.10, so the left-hand tail is very short.
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