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It looks like your symbolic notation means that you need to ADD x[sub:3or96hhs]1[/sub:3or96hhs]/49 + x[sub:3or96hhs]2[/sub:3or96hhs]/49 + x[sub:3or96hhs]3[/sub:3or96hhs]/49...up to and including x[sub:3or96hhs]11[/sub:3or96hhs]/49. Remember that when you add fractions with the same denominator, you add the numerators, and put the result over the common denominator. So, for example, if you are adding 3/49 + 5/49 + 16/49, that would be (3 + 5 + 16)/ 49, or 24/49
Follow those directions, and you should be able to arrive at the correct answer...except that your directions say that you need to express your answer to two decimal places.