book Maths Puzzle Numerical Ability

Can you help with this question?

Say that the variance of a set of data is 24/5. At a minimum, about how many data points will be within 4.3818 of the mean of measurements?

A. 4/5
B. 3/4
C. 2/3
D.1/2

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Hi,
I could use some help with this.
Lisa is flying her kite with 62 feet of string attached to the ground. She measures 5feet of string from the ground to a point 4 feet high. How high is her kite? A retiree divides his pension portfolio of $270,000 between a conservative mutual fund paying at a rate of 4% and high risk bonds paying at a rate of 8%. Both investments pay the same amount of interest anually. How much is invested in each investment?