Question

Daisy measured the heights of 20 plants.

Answer 1

Answer:

• 30.5 cm

Step-by-step explanation:

Refer to attached

• Height of plants (h) >> Frequency >> Midpoint >> Frequency x midpoint
• 0 <h < 10 >>  1  >> 5 >> 5
• 10 <h < 20 >> 4 >> 15 >>  60
• 20 <h < 30 >> 7 >> 25 >> 175
• 30 <h < 40 >> 2 >> 35 >> 70
• 40 <h < 50 >> 3 >> 45 >> 135
• 50 <h < 60 >> 3 >> 55 >> 165

Sum of frequencies = 20

Sum of frequency x midpoint product = 610

Mean height

• 610/20 = 30.5 cm