The frequency table shows how many visits to the library students in a school have made in the last month. VisitsFrequency
022
1302
267
3208
455
589

Work out the mean.
Give your answer rounded to 1 DP.

what's that

a - base

b - exponent

so,

"standard form:

3x2 + 14x − 10 = 0

solutions based on quadratic formula:

x1   = −14 − √ 142 − 4×3×(−10) /   2×3   = −14 − 2 × √ 79 /   6   ≈ −5.296

x2   = −14 + √ 142 − 4×3×(−10) /   2×3   = −14 + 2 × √ 79 /   6   ≈ 0.629