Interquartile range

[kyc15101]

After you achieve negative y results, your interquartile range is going to have to match the class data. Your strategy of using exponential functions to narrow the range is good, but you're going to have to keep plugging in values of coefficients for the exp functions until you achieve this.

[oms15106]

Yes I have tried plugging different values a lot but no luck. But thanks for the advice!