Since the image is not very clear, I am using the below values.
Mean(x) = 1259
Std Dev(s) = 31
a)
Empirical rule states that 68% of the data points lie in the range {x-s, x+s}
= {1259-31, 1259+31} = {1228, 1290}
b)
68% of the data points lie in the range {x-2s, x+2s}
= {1259-2*31, 1259+2*31} = {1197, 1321}
c)
99.7% or ~100% of the data points lie in the range {x-3s, x+3s}
= {1259-3*31, 1259+3*31} = {1166, 1352}
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