WILL GIVE MEDAL!
Find the value of x such that the data set has the given mean.
3.8, 4.2, 5.3, x; mean 4.8

Question

WILL GIVE MEDAL!
Find the value of x such that the data set has the given mean. 
3.8, 4.2, 5.3, x; mean 4.8

amoodarya · Answer

$$4.8=\frac{3.8+4.2+5.3+x}{4}$$you can find x

anonymous · Answer

@amoodarya so would it be 3.325?

anonymous · Answer

@amoodarya x= 3.325?

amoodarya · Answer

i think so

amoodarya · Answer

no 
it is not 
x=4(4.8)-5.3-4.2-3.8=5.9

welshfella · Answer

5.9 is correct

anonymous · Answer

@welshfella could you explain to me how you get 5.9? I'll give you a medal

amoodarya · Answer

$$4.8=\frac{3.8+4.2+5.3+x}{4}\\frac{4.8}{1}=\frac{3.8+4.2+5.3+x}{4}\4.8 *1=3.8+4.2+5.3+x\$$

welshfella · Answer

first you cross multiply
4 * 4.8 = 19.2
so  
3.8 + 4.2 + 5.3 + x = 19.2
adding the numbers on the left
13.3 + x = 192
now subtract 13.3 from both sides (this will leave x on its own on left side)
13.3   +  x    =     19.2  
      - 13.3                   - 13.3

x = 5.9

welshfella · Answer

cross multiply:-
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