Use the given mean to find the missing number in each data set.
12,b,17;mean:14
7,8,8,b;mean:8
1,1,2,4,5,b,10,10;mean:5
76,77,77,b,86,88,91;mean:82
2007-12-05 15:41:49 · 5 answers · asked by DJS 1 in Science & Mathematics ➔ Mathematics
b=blank the blank of the missing number
2007-12-05 15:43:01 · update #1
14=12+b+17/3
b=14
8=7+8+8+b/4
b=9
1+1+2+4+5+b+10+10/8=5
b=7
82=76+77+77+b+86+88+91/7
b=76
hope it helped.
2007-12-05 15:48:23 · answer #1 · answered by Anonymous · 0⤊ 1⤋
For each, the mean is the sum of elements, divided by the number of elements.
12,b,17;mean:14
(12 + b + 17)/3 = 14, Multiply both sides by 3
12 + b + 17 = 42
b + 29 = 42
b = 13
7,8,8,b;mean:8
(7+8+8+b)/4 = 8
7+8+8+b = 32
23+b=32
b=9
1,1,2,4,5,b,10,10;mean:5
(1+1+2+4+5+b+10+10)/8 = 5
1+1+2+4+5+b+10+10 = 40
33+b = 40
b=7
76,77,77,b,86,88,91;mean:82
(76+77+77+b+86+88+91)/7=82
76+77+77+b+86+88+91= 574
495+b=574
b=79
2007-12-05 16:26:33 · answer #2 · answered by LDJ 3 · 0⤊ 0⤋
(12+b+17)/3 = 14 --> b = 13
(7+8+8+b)/4 = 8 --> b = 9
(1+1+2+4+5+b+10+10)/8 = 5 --> b = 7
(76+77+77+b+86+88+91)/7 = 82 --> b = 79
2007-12-05 15:56:54 · answer #3 · answered by ironduke8159 7 · 0⤊ 0⤋
13
9
7
79
these are correct by the way
2007-12-05 15:49:08 · answer #4 · answered by Anonymous · 0⤊ 0⤋
13
9
7
79
2007-12-05 15:55:44 · answer #5 · answered by brian 2 · 0⤊ 0⤋