This means that one calculates the mean by adding up all the values, and then divide by the number of values. For the example above, the mean is:
ð ɪ s WORD_BOUNDARY m iː n z WORD_BOUNDARY ð æ t w ʌ n WORD_BOUNDARY k æ l k j ʊ l eɪ t s WORD_BOUNDARY ð ə WORD_BOUNDARY m iː n WORD_BOUNDARY b aɪ WORD_BOUNDARY æ d ɪ ŋ WORD_BOUNDARY ʌ p WORD_BOUNDARY ɔ l WORD_BOUNDARY ð ə WORD_BOUNDARY v æ l j uː z WORD_BOUNDARY æ n d WORD_BOUNDARY ð ɛ n WORD_BOUNDARY d ɪ v aɪ d WORD_BOUNDARY b aɪ WORD_BOUNDARY ð ə WORD_BOUNDARY n ʌ m b ə ɹ ɹ WORD_BOUNDARY ʌ v WORD_BOUNDARY v æ l j uː z WORD_BOUNDARY f ə ɹ ð ɪ WORD_BOUNDARY ɛ ɡ z æ m p ə l WORD_BOUNDARY ə b ʌ v WORD_BOUNDARY ð ə WORD_BOUNDARY m iː n WORD_BOUNDARY ɪ z WORD_BOUNDARY