What does material non-random strength (f_t) mean?

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Non-random strength (f_t) refers to a fixed, consistent value of material strength that does not fluctuate. The size effect in materials indicates that as the size of a structural element increases, its strength may decrease due to factors like flaws and defects becoming more significant. This phenomenon suggests that larger structures are more likely to fail under stress compared to smaller ones. Understanding these concepts is crucial for predicting material behavior in engineering applications. The relationship between non-random strength and size effect is essential for designing safe and reliable structures.
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What does non-random strength (f_t) and random strength (f_t) mean ?
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https://en.wikipedia.org/wiki/Size_effect_on_structural_strength#cite_note-1I don't understand about non-random strength (f_t) and size effect of material
And please explain to me for the size effect? :cry::cry::cry::cry::cry:
 
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Non-random ( somewhat the opposite of random in this case but not necessarily ).
Non-random strength of a material would mean that it is fixed, never varying, an absolute value.
 

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