The average (arithmetic mean) of a normal distribution of a school's test scores is 65, and standard deviation of the distribution is 6.5. A student scoring a 72 on the exam is in what percentile of the school?
Choices Choose the correct choice from the following options.
A) 63rd percentile B) 68th percentile C) 84th percentile D) 96th percentile E) 98th percentile
(78-65)/6.5= 
<gadget id="calculator">(78-65)/6.5</gadget>
<output>2</output>
2 sigmas or 95.5th percentile for +-2 sigma but in our case we need only upper tail, so it's 100 - (100 - 95.5)/2= 68th percentile   68th percentile
<result>B</result>
The average (arithmetic mean) of a normal distribution of a school's test scores is 65, and standard deviation of the distribution is 6.5. A student scoring a 72 on the exam is in what percentile of the school?
Choices