Variance and Standard Deviation (Ungrouped Data)

Note: In this video at 0:22-0:27, I mistakenly said that mean is measures of central location. Supposedly, mean is a measure of central tendency. Hopefully you all don't get confuses. Tq.🙌 In this video, I used calculator Casio fx-82ES (black color) and Vinacal Vn-570MS (grey color). Those who are using calculator: 1) Casio fx-570MS follow Vinacal Vn-570MS (grey color) in this video. 2) Casio fx-570ES follow Casio fx-82ES (black color) in this video. Note: Sorry for the background noise (ceiling fan).