The time it takes to ring up a customer at the grocery store follows an exponential distribution with a mean of 3.5 minutes. what is the probability density function for the time it takes to ring up a customer?

Step-by-step explanation:

The probability density function with exponential random variable T(t>0) with mean is given by :-

Given : The time it takes to ring up a customer at the grocery store follows an exponential distribution with a mean of 3.5 minutes.

i.e.

Then , the probability density function for the time it takes to ring up a customer is :

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d. 5.43x1012 h.5.43e12