Calculate the Standard deviation of the grouped data shown in the frequency table below: Classes frequency 50 – 59 3 60 – 69 5 70 – 79 9 80 – 89 12 90 – 99 8

Complete the table below: Weight (in kg) 40-44 45-49 50-54 55-59 60-64 65-69 70-74 75-79 Frequency 1 14 15 21 14 10 4 1 What is the frequency of the median class?

Data was collected for 322 randomly selected 10 minute intervals. For each ten-minute interval, the number of people entering the atrium of a large mall were recorded. The data is summarized in the table below. Number  of Guests      Frequency    220 – 224 98 225 – 229 81 230 – 234 36 235 – 239 63 240 – 244 44 What is the class width for this GFDT?Class width =

Finish times (to the nearest hour) for 59 dogsled teams are shown below. Draw a relative-frequency histogram. Use five classes.  261 274 236 244 280 296 284 296 288 288 250 256 338 360 341 333 261 267 287 296 313 311 307 307 299 303 277 283 304 305 286 290 286 287 297 299 332 330 309 326 307 326 285 291 295 298 306 315 310 318 318 320 333 321 323 324 327 302 319   ​ The frequency table for the above data is given below.  Class Limits Boundaries Midpoint Freq. Relative Freq. Cumulative Freq. 236 – 260 235.5 – 260.5 248 4 0.07 4 261 – 285 260.5 – 285.5 273 9 0.15 13 286 – 310 285.5 – 310.5 298 26 0.44 39 311 – 335 310.5 – 335.5 323 17 0.29 56 336 – 360 335.5 – 360.5 348 3 0.05 59