Can someone pls help me with these I've been stuck on them from a while

Chapter 3 2 . For a school production, Marcia bought the fabric for making costumes and backdrops. The different fabrics cost varying amounts per metre. Calculate the mean cost per metre of cloth. COST OF FABRIC BOUGHT FOR SCHOOL PRODUCTION Cost per metre $5.89 $12.49 $35.29 Number of metres 38 12 3 purchased On clo 3. Dev is studying in the apprenticeship plumber/gasfitter program at Aurora College's Thebacha Campus in Fort Smith, NT. In his blueprint reading, sketching, and drawing course, he has earned the following marks: . 70% on the first assignment . 79% on the second assignment . 68% on the first quiz . 81% on the second quiz To calculate his final grade, each assignment is worth 10%, each quiz is worth 15%, and the final exam is worth 50%. If he wants to earn 80% in the course, what mark does he have to earn on the final exam? 4. The students in Madison's class have the following heights: 167 cm, 200 cm, 155 cm, 135 cm, 142 cm, 143 cm, 137 cm, 155 cm, 143 cm, 164 cm, 161 cm, 139 cm, 152 cm, 143 cm a) Calculate the mean, median, and mode. Which do you think best represents the average height in the class? Why