Find the standard deviation of sample data summarized in a frequency distribution table by using the formula below, where x represents the class midpoint, f represents the class frequency, and n represents the total number of sample values. Also, compare the computed standard deviations to these standard deviations obtained by using Formula 3-4 with the original list of data values:

Pulse Rates ofFemales ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Frequency60?69..................................................1270?79..................................................1480?89..................................................1190?99....................................................1100?109...............................................1110?119...............................................0120?129................................................1

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n[E(f•x³)] – [E(f •x)]² s = standard deviation for frequency distribution n(n – 1)