ເຄື່ອງຄິດເລກເລກຄະນິດສາດໃນຊ່ວງເວລາ Intervels1-10,11-20,21-30,31-40,41-50 Enter the Numbers with Comma separated(,) Friquency5,20,40,80,100 Enter the Numbers with Comma separated(,) Result: No.of Inputs Arithmetic Mean