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b)
The table shows information about the numbers of hours 30 children
spent on their tablets one evening.
Number of hours (h) Frequency
0 << 1
6
1 13
2 7
3 4
a) Find the class interval that contains the median.
b) Work out an estimate for the mean number of hours.

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb

umm you say your want to . but you do know that this is the mathematics.  

o~o