There is an error in the test suite. The solutions act as though the value of numClass is always 4 when setting the bin width, but then use the correct value of numClass when doing the histogram.
I have fixed the error
Duplicate each element of a vector.
Find nearest prime number less than input number
sum of non-primes
Mean = Standard Deviation
Check if the input is an interprime
Calculate trends in time series
Repeat string n times
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