[tex]\sf{If\:the\:mean\:of\:x_1\:and\:x_2\:is\:M_1\:and\:that\:of\:x_1,x_2,x_3,x_4\:is\:M_2, } \\\sf{then\:mean\:of\:ax_1,ax_2,\dfrac{x^{3}}{a},\dfrac{x^{4}}{a}\: is }[/tex]
OPTIONS :
1. [tex]\sf{\dfrac{M_1+M_2}{2}[/tex]
2. [tex]\sf{\dfrac{aM_1+\dfrac {M_2}{2})}{2}}[/tex]
3. [tex]\sf{\dfrac{1}{2a}[(a^{2}-1)M_1 +2M_2]}[/tex]
4. [tex]\sf{\dfrac{1}{2a}[2(a^{2}-1)M_1 +2M_2]}[/tex]
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.hope it helps....................