Question
Find $P[1 \leq x \leq 3]$.
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| Year | $2010$ | $2011$ | $2012$ | $2013$ | $2014$ | $2015$ |
| Index number | $130$ | $132$ | $96$ | $144$ | $138$ | $108$ |
| Items | $A$ | $B$ | $C$ | $D$ | $E$ | $F$ |
| Weight | $5$ | $10$ | $10$ | $30$ | $20$ | $25$ |
| Percentage price relative | $290$ | $315$ | $280$ | $300$ | $315$ | $320$ |