9709/61/M/J/24 CAIE A-level Statistics 2 Solution

[@Lav_Pixie2007]

Thank youuuuuuu

[@Tsuuyoka]

I don't understand for qs 4a, the mean is 255.5 so should divide by n for calculating variance? 😢

[@cixiangng]

we just use the formula of unbiased estimated mean and variance.