10 The table gives information about the heights of 50 trees. Height (h metres) Frequency 0 < h - 4 ,8, 4 < h - 8 ,21, 8 < h - 12, 12, 12 < h - 16, 7, 16 < h - 20, 2. Work out an estimate for the mean height of the trees.

First find the appropriate mid points of each set of intervals. These will be 2, 6, 10, 14 and 18, and you get these my dividing in two the interval range. Then multiply each midpoint by the corresponding frequency and sum each one. Therefore: (2x8) + (6x21) + (10x12) + (14x7) + (18x2). The sum total should be 396. You then have to divide by the total frequency for the estimate of the mean, the final answer is then 7.92.

Answered by Charlie W. Maths tutor

6669 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

How many roots does the following equation have? 2x^2 + 4x +2 = 0


Suppose we have a circle with the equation x^2 +y^2 =25. What is the equation to the tangent to the circle at point (4,3)?


Solve for x and y: 2x +5y + 5= 0 , 2y + 31= 5x


An isosceles triangle ABC has a perimeter of 16cm. AB = x+3, AC = x+4. Calculate the area of ABC.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences