Grouped Data The weighted mean computation can be used to obtain approximations of the mean, variance, and standard deviation for the grouped data.
{"Image DocumentName": "Grouped DataThe weighted mean computation can be used to obtain approximations of the mean, variance, and standard deviation for the grouped data.", "Image ImageDescription": "To compute the weighted mean, we treat the midpoint of each class as though it were the mean of all items in the class. We compute a weighted mean of the class midpoints using the class frequencies as weights. Similarly, in computing the variance and standard deviation, the class frequencies are used as weights.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}