Question

can not figure this one out from the book…

The paper "Microwave Observations of Daily Antarctic Sea-Ice Edge Expansion and Contribution Rates" states that "The distrubution of the daily sea-iceadvance/retreat from each sensor is similar and is approximately double exponential."the proposed double exponential distribution has density functionf(x)=.5λe-λx for -∞<x<∞. The standard deviation is given as 40.9 km.

a) what is the value of the parameter λ?

b) what is the probablility that the extent of daily sea-ice change is within 1 standard deviation of the mean value?

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