Answers
From the histogram , we observe that the it is not symmetric , the distribution is positively skewed.
First find the mean 
Therefore
So locate -6.42,-1.50, 3.42, 13.26,18.18,23.10 on the histogram
In the range ( 3.42,13.26 ) there are 24 numbers in the data set are lies , so % of data numbers lies in interval ( 
According to Empirical rule approximately 68% of the observations fall within ( 
In the range ( -1.50,18.18 ) there are all 40 numbers in the data set are lies , so % of data numbers lies in interval ( 
According to approximately 95% of the observations fall within ( 
In the range ( -6.42,23.10 ) there are all 40 numbers in the data set are lies , so % of data numbers lies in interval ( 
According to approximately 99.7% of the observations fall within ( 
Empirical rules stated for the symmetric distribution, therefore from the above result we can say that the given distribution of the radon concentration is not symmetric.
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