The percentile formula calculator will find the score for the desired percentile for a data set.  First, enter the data set and desired percentile and you’ll get the answer. Then, you will get a step-by-step explanation on how to do it yourself.  The desired percentile represents the percent of numbers in the data set that have values at or below the number that we’ll calculate.

The percentile formula calculator will find the score for the desired percentile for a data set. 

Afterward, see the Percentile Rank Calculator if you have a score and need to find its percentile rank.  You GOT this!

Percentile Calculator


Answer:

The 64th percentile is: 237


Solution:

In this problem, you want to find the 64th percentile in the data set. At least 64% of the data values will be less than this number.

Take note that there are 18 data values in this data set. Therefore, $N = 18$.

We need to sort them in ascending order.

$ 149, 165, 180, 187, 190, 199, 213, 213, 220, 232, 233, 237, 259, 267, 268, 277, 284, 299 $

The index of the sorted data set represents the position. The first number, 149 has an index of 1, the second, 165 has an index of 2, etc. To find the index of the 64th percentile, apply the formula $$ i = \frac{p}{100} \cdot N $$

where i represents the index. Substituting in the values for this problem, we have $$ i = \frac{64}{100} \cdot 18 $$ $$ i = 11.52 $$

If i were an integer, the percentile would be found by taking the average of the data values at positions i and i + 1 in the sorted data set. Since i is not an integer in this problem, we round i up to the nearest whole number. $$ i = 12 $$ Counting 12 data values in the sorted data set from the beginning, the data value at position 12 is 237.

Therefore, the 64th percentile is: 237

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