gh-149949 :Validate invalid inputs in kde,kde_random functions in statistics.py

[ghost]

The following PR fixes validation by checking all data points for the given data argument in kde() and kde_random() functions in the statistics module.

Modified the code from this:

if not isinstance(data[0], (int, float)):
        raise TypeError('Data sequence must contain ints or floats')

to:

if not all(isinstance(x, (int, float)) for x in data):
        raise TypeError('Data sequence must contain ints or floats')

• Issue: kde and kde_random functions in statistics.py accept invalid arguments #149949

[picnixz]

The data sequence can be very large. It is unnecessary IMO. This is a GIGO in this case. For instance, other functions do not really check for that. Can you refrain from creating PRs when the problem has not yet been acknowledged as well please?

[bedevere-app]

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