The number of minutes between arrivals of the Culver City C3 bus is represented as follows. Time Frequency 40-49 16 50-59 88 60-69 46 70-79 12 80-89 214 90-99 22 100-109 2 (a) Approximate the mean length of time between arrivals. (b) Approximate the standard deviation of the length of time between arrivals.

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The number of minutes between arrivals of the Culver City C3 bus is represented as follows.

Time Frequency
40-49 16
50-59 88
60-69 46
70-79 12
80-89 214
90-99 22
100-109 2

(a) Approximate the mean length of time between arrivals.

(b) Approximate the standard deviation of the length of time between arrivals.

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