the mean of 50 observations is 100. but later he found that there is decrements of 13 from each observations. what is the the updated mean is?	Pick one
A) 87  B) 97  C) 67  D) 57  E) 46
<gadget id="calculator">100 - 13</gadget>
<output>87</output>

<result>A</result>
the mean of 50 observations is 100. but later he found that there is decrements of 13 from each observations. what is the the updated mean is?
subtract(100, 13)
"87 answer is a"