If elements in the data increase arithmetically when placed in some order, then the median and arithmetic average are equal.
ɪf ˈɛlɪmənts ɪnðə dˈeɪɾə ˈɪŋkɹiːs ˌæɹɪθmˈɛɾɪkli wɛn plˈeɪst ɪn sˌʌm ˈɔːɹdɚ, ðˈɛn ðə mˈiːdiːən ænd ɚɹˈɪθmətˌɪk ˈævɹɪdʒ ɑːɹ ˈiːkwəl.