Bienaymé-Chebyshev Inequality/Historical Note

Historical Note on Bienaymé-Chebyshev Inequality
The result now known as the Bienaymé-Chebyshev Inequality was first formulated, without proof, by in $1853$.

The proof was provided by his friend and colleague in $1867$.

's student provided another proof in his $1884$ Ph.D. thesis.