How can I get a real average from many measurements?

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I am measuring fuel level from a car. I am getting too many different values.

for example:

the real value on the car's board is 50%.

when I measure 10 successive values: 51% | 50% | 49% | 56% | 51% | 49% | 48% | 50% | 53% | 54%

So I calculated the average and I get 51%! (sometimes I get a difference of 5% and 6%)

two values are different (50% and 51%) because of perturbations values like 56%. so how can we use a simple equation to eliminate the perturbation and get a real measure?

thank you