Satu sampel 200 pelajar statistik mendapat markah seperti dalam jadual di bawah. Taburan markah pada tahun-tahun sebelumnya adalah seperti berikut: 14% A, 26%B, 31%C, 19%D dan 10%F. Gunakan aras keertian 0.05 untuk menguji sama ada taburan markah telah berubah secara signifikan daripada tahun-tahun sebelum ini.​

Will make ! for correct answer the dot plot below shows the number of toys 21 shops sold in an hour.is the median or the mean a better center for this data and why? a. median; because the data is not symmetric and there are outliersb. median; because the data is symmetric and there are no outliersc. mean; because the data is symmetric and there are no outliersd. mean; because the data is skewed and there are outliers