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Mathematics: Post your doubts here!

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the url has expired i cant see the image
 
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quick question. If a body is about to topple (without sliding), what is the relationship b/w F and μR ? Should it be F<μR or opposite
Also if the body is about to slide (without toppling) should it be F<μR or something else?
 
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PLEASE HELP and THANKS !!

The random variable X has a normal distribution with mean μ and standard deviation σ.
(i) if 2μ = 1.5 σ, find P(X<3μ).
(ii) if P(X>1/3μ ) =0.7257, express μ in terms of σ.
 
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Help !
kindly explain value of "common ratio" obtained
Thanks in Advance. :)
 
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