Укажите правильную формулу для вычисления среднего значения временного ряда x<img src="/close/store/examRes/%7B384C18D3-50E2-4417-887F-E43D9C3EB86B%7D/%D0%A2%D0%B5%D1%81%D1%824_%D0%A1%D1%80%D0%B5%D0%B4%D0%97%D0%BD%D0%B0%D1%87_%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D0%B02.png" /><img src="/close/store/examRes/%7B384C18D3-50E2-4417-887F-E43D9C3EB86B%7D/%D0%A2%D0%B5%D1%81%D1%824_%D0%A1%D1%80%D0%B5%D0%B4%D0%97%D0%BD%D0%B0%D1%87_%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D0%B01.png" /><img src="/close/store/examRes/%7B384C18D3-50E2-4417-887F-E43D9C3EB86B%7D/%D0%A2%D0%B5%D1%81%D1%824_%D0%A1%D1%80%D0%B5%D0%B4%D0%97%D0%BD%D0%B0%D1%87_%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D0%B03.png" /> <img src="/close/store/examRes/%7B384C18D3-50E2-4417-887F-E43D9C3EB86B%7D/%D0%A2%D0%B5%D1%81%D1%824_%D0%A1%D1%80%D0%B5%D0%B4%D0%97%D0%BD%D0%B0%D1%87_%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D0%B01.png" />, <img src="/close/store/examRes/%7B384C18D3-50E2-4417-887F-E43D9C3EB86B%7D/%D0%A2%D0%B5%D1%81%D1%824_%D0%A1%D1%80%D0%B5%D0%B4%D0%97%D0%BD%D0%B0%D1%87_%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D0%B02.png" />, <img src="/close/store/examRes/%7B384C18D3-50E2-4417-887F-E43D9C3EB86B%7D/%D0%A2%D0%B5%D1%81%D1%824_%D0%A1%D1%80%D0%B5%D0%B4%D0%97%D0%BD%D0%B0%D1%87_%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D0%B03.png" />