Find the mean of the following frequency distribution:
$x_i$ $5$ $15$ $25$ $35$ $45$ $55$ $f_i$ $12$ $18$ $27$ $20$ $17$ $6$
| $x_i$ | $5$ | $15$ | $25$ | $35$ | $45$ | $55$ |
| $f_i$ | $12$ | $18$ | $27$ | $20$ | $17$ | $6$ |
- A$28$
- B$20$
- C$18$
- D$26$
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