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## Homework Statement

I am a freshman in physics, just done a lab about radioactive decay.

I've measured the # of beta particles per second 400 times and got the frequency of each number K using Excel.

I'm supposed to take the data and fit it to a puason distribution in MATlab.

The data points themselves seem to be on a nice curve.

The problem I'm having is that the equation for the probabilty doesn't seem to curve at all.

## Homework Equations

Puason distribution in radioactive decay: the chance that K beta particles will be detected in 1 second is

P(k) = e^-λ * λ^K/K!

## The Attempt at a Solution

I've made an excel chart which shows λ^K/K! for many different K values, and then tweaked the lambda value.

For all the values of λ I've tried, λ^K/K! always increases for increasing values of K, meaning the graph never curves back down. What am I doing wrong?

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