SECTION A. The following sample data set list the amount of 34 families spending weekly at Costco. IMPORTANT: Please do it in excel) 280 380 190 70 43 476 325 658 250 330 369 450 420 421 326 563 522 566 51 626 636 176 512 134 231 553 657 854 345 644 876 123 876 456 a) Construct a frequency distribution that has 6 classes. b) Use the frequency distribution from (a) to find the mean, variance and standard deviation of the distribution. IMPORTANT: Please do it in excel)