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DS-1000 / 761 / How to calculate kurtosis (the fourth standardized moment, according to…

Problem

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Problem:
How to calculate kurtosis (the fourth standardized moment, according to Pearson’s definition) without bias correction?
I have tried scipy.stats.kurtosis, but it gives a different result. I followed the definition in mathworld.
A:
<code>
import numpy as np
a = np.array([   1. ,    2. ,    2.5,  400. ,    6. ,    0. ])
</code>
kurtosis_result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Scipy

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Source and history

upstream_id / Original problem ID
761
task_id
dc7e43a6-13e2-5773-b6e1-133e708961f9
task_key
default--test--761
task_revision_id
1
config / split
default / test

Official source

initial import