How to Calculate the Mean of Longboard and Shortboard Data Sets (Rounded to One Decimal Place)

Question

Compute the means for both longboards and shortboards. The mean for longboards is □ days. (Round to one decimal places as needed.)
Longboard data: 20, 12, 15, 17, 6, 17, 13, 19, 10, 16, 21, 7, 5, 21, 18, 6, 12, 12, 10, 8, 5, 21, 6, 20, 12, 4, 15, 8, 11, 9
Shortboard data: 11, 9, 9, 18, 17, 5, 10, 14, 4, 15, 9, 14, 14, 14, 7, 8, 18, 15, 8, 10, 15, 20, 18, 7, 19, 5, 20, 9, 15, 7, 5

Accepted Answer

Longboard mean: 12.7; Shortboard mean: 11.5

Answer

Step 1: Calculate the sum of longboard data. Add all the longboard values together: 20+12+15+17+6+17+13+19+10+16+21+7+5+21+18+6+12+12+10+8+5+21+6+20+12+4+15+8+11+9 = 381 Step 2: Find the number of longboard data points. Count the values: there are 30 data points for longboards. Step 3: Compute the longboard mean. Divide the total sum by the number of data points: 381 ÷ 30 = 12.7, which is already rounded to one decimal place. Step 4: Calculate the sum of shortboard data. Add all the shortboard values together: 11+9+9+18+17+5+10+14+4+15+9+14+14+14+7+8+18+15+8+10+15+20+18+7+19+5+20+9+15+7+5 = 356 Step 5: Find the number of shortboard data points. Count the values: there are 31 data points for shortboards. Step 6: Compute the shortboard mean. Divide the total sum by the number of data points: 356 ÷ 31 ≈ 11.5 when rounded to one decimal place.