78 appears more than any other number, so it is the mode.
83
To find the mean, add the numbers (84 + 85 + 88 + 89 + 82 + 78 + 82) to get 508, then divide by 7, resulting in a mean of approximately 72.57. The median is the middle value when the numbers are arranged in order (78, 82, 82, 84, 85, 88, 89), which is 84. The mode is the number that appears most frequently, which is 82. The range is the difference between the highest (89) and lowest (78) values, giving a range of 11.
Range = 89 - 78 = 11
For 98 78 86 88 84 81 93 92 89 and 81: σ=6.2361
400 - 78 - 22 --84 - 16 - 81 - 19 - 27 = 400 - 78 - 22 + 84 - 16 - 81 - 19 - 27 = 241
Median: 80 Mode: 72, 80, 120, 98, 78, 84, 77
70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85 (including 70 and 85)
mean = 81.
902
The composite numbers are: 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86 ,87, 88
62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88.60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90
Natural isotopes of krypton are: Kr-78, Kr-80, Kr-81, Kr-82, Kr-83, Kr-84, Kr-86.