The number of students in 40 schools in a certain sub-county were recorded as follows:

238 100 173 115 398 597 572 299

255 750 587 403 250 217 797 386

362 486 453 279 436 248 780 316

529 305 372 286 842 235 420 492

226 245 695 720 267 617 198 830

- Complete the frequency distribution table below for the data.
Number of students | 100-199 | 200-249 | 250-399 | 400-599 | 600-799 | 800-849 |

Number of schools | | | | | | |

- draw a histogram to represent the data.

- Use the histogram to estimate the:
- median;
- number of schools with more than 350 students.