Students were timed as they attempted to perform a simple test of dexterity. The incomplete data of results is shown below. Find x, if the mean time taken was 16 seconds.
Time Taken (s) Frequency
(0 - 10) 20
(10 - 20) 50
(20 - 30) x
My equation:
850x + 25x /16= 70 + x
850 + 24x / 16= 70
850 + 24x = 1120
24x = 270
x = 11.25
Is my equation wrong or did I make a mistake?
1 answer
i realised what went wrong order of operations x is 30 :)
1 answer