Listed below is a sample of duration times (seconds) of eruptions of the Old Faithful geyser. Use the range rule of thumb to estimate the value of the standard deviation of all duration times, and compare the result to the standard deviation of 33.7 seconds found from a sample of 2634 duration times.

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226 228 247 247 253 256 250 254 229 242 250 241 226 240 117