51 and 58 are both the mode
52, 54, 55, 56, 57, 58
(51+57)/2 = 54
U.S. Presidents who were between 55 and 60 while serving, in order of age at the time of taking office:Grover Cleveland (47-51, 55-59)Calvin Coolidge (51-56)Franklin D. Roosevelt (51-63)William H. Taft (51-55)Chester A. Arthur (51-55)Abraham Lincoln (52-56)Jimmy Carter (52-56)William McKinley (54-58)Martin Van Buren (54-58)Rutherford B. Hayes (54-58)George W. Bush (54-62)Herbert Hoover (54-58)Lyndon Johnson (55-60)Warren G. Harding (55-57)Benjamin Harrison (55-59)Richard Nixon (56-61)Woodrow Wilson (56-64)Andrew Johnson (56-60)George Washington (57-65)John Quincy Adams (57-61)Thomas Jefferson (57-65)James Madison (57-65)James Monroe (58-66)
-20
51-LI 52-LII 53-LIII 54-LIV 55-LV 56-LVI 57-LVII 58-LVIII 59-LIX 60-LX
53
51, 52, 53, 54, 55, 56, 57, 58, 59. Of those 53 and 59 are prime numbers.
51 54 57
50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70
Range: 24 Median: 59.5 Mode: 57, 61, 58, 54, 68, 51, 65, 75
55 counts twice # 5 # 15 # 25 # 35 # 45 # 50 # 51 # 52 # 53 # 54 # 55 # ->55 # 56 # 57 # 58 # 59 # 65 # 75 # 85 # 95
The composite numbers between 50 and 65 are 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65