Before working with any range of numbers you need to put them from smallest to largest, so it would be: (15, 43, 46, 48, 53, 69, 90).
To find the mean you add up all the numbers and divide by how many numbers there are in the sequence. (In this case there are 7). (15+43+46+48+53+69+90)/7= 52 Mean= 52
To find the median you find the middle most number of the sequence, which is 48. If you need help doing this, all you do is cross out one number at a time at the beginning then at the end, continuously. Median= 48
To find the mode of this sequence you see which number appears the most often, but in this case there isn't a number that appears more than once. Mode= no mode
Finding the range is pretty simple, you subtract the largest number by the smallest number (90-15) Range= 75
