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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Administered – For this word;  the “A” turns into an i-schwa;  the “d” is (usually) stopped;  the first “i” is short;  the second “i” is an i-schwa;  for the “-er” suffix – the “e” disappears (this is the standard pronunciation of this suffix in The Common Tongue);  and since the root-word ends with the letter “r” – the “e” of the “-ed” ending is silent and the final “d” is a flap-d, but is (often) stopped.

– /ih[d]-MIH-nih-st’r[d]/ – /ə(ɪ)[d].ˈmɪ.nə(ɪ).stɚ[ɾ]/ – Notice also that the stress is on the second syllable –

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See Also:  Administer, Administration, & Administrative

Learn More About The Word “Administered” On Wiktionary

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