Ma=a1+a2+a3+...+a10/10=41 a1+a2+a3+...+a10=410 a10=50 a1+a2+a3+...+a9=410-50=360 Ma=a1+a2+a3+...+a9/9=360/9=40

                                [latex]m_{a1} = frac{a_1+a_2+a_3+a_4+a_5+a_6+a_7+a_8+a_9+a_{10}}{10}=41 \ \ a_{10}=50 \ \ m_{a1} = frac{a_1+a_2+a_3+a_4+a_5+a_6+a_7+a_8+a_9+50}{10}=41 \ \ => S=a_1+a_2+a_3+a_4+a_5+a_6+a_7+a_8+a_9+50 = 41 * 10 \ S=a_1+a_2+a_3+a_4+a_5+a_6+a_7+a_8+a_9+50 = 410 \ a_1+a_2+a_3+a_4+a_5+a_6+a_7+a_8+a_9 = 410-50 = 360 \ \ => m_{a2} =frac{a_1+a_2+a_3+a_4+a_5+a_6+a_7+a_8+a_9}{9}= frac{360}{9}=40 [/latex]