Write a function that gives the mean digit (round towards nearest integer) of an input and positive number. For example:
x = 264 --> y = 4
x = 128 --> y = 4
Test Suite problem #4 has an incorrect value.
Test suite #4 is incorrect
Find all elements less than 0 or greater than 10 and replace them with NaN
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Project Euler: Problem 2, Sum of even Fibonacci
Back to basics 6 - Column Vector
Ratio between sum of primes and sum of factors
Ratio between sum of primer numbers and non-prime numbers
Approximate the inverse tangent by power series
Say type of roots in quadratic equation
Sum of a geometric series
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