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What set of numbers has a mean of 80?
There are an infinite number of sets with mean 80. Here are some: {80, 80, 80}, {80, 80, 80, 80, 80, 80} {79, 80, 81}, {79, 79, 80, 81, 81}, {79, 79, 80, 82} (1, 80, 159}, {-40, 200} To produce a set of n numbers with mean 80, start with any set of n-1 numbers. Suppose their sum is S. Then add the number 80*n-S to the set. You will now have n numbers whose sum is S+80*n-S = 80*n So the mean of this set is 80.
21 n on the g s?
21 notes on the great scale
One half of the students in alex's science class are girls one third of the girls in the class have blonde hair if 10 girls do not have blonde hair how many students are in alex's science class?
Let's say that s is the total number of students, b is the number of boys, g is the total number of girls, n is the number of non-blonde girls, and e is the number if blonde girls. We know that s = b + g, b = g, g = n + e, e = g/3, and n = 10. Substituting for b in the first equation gives us s = g + g = 2g Then we substitute for n and e in the third equation and solve for g: g = g/3 + 10 g - g/3 = 10 g - (1/3)g = 10 (2/3)g = 10 g = 10 x (3/2) = 15 Finally, solve for s: s = 2g = 2 x 15 = 30
Which letters in the alphabet have no lines of symmetry?
a b d e f F g G j J k L m n N p P q Q r R s S t u y z Z
Do you divide or multiply by 9.8 to get from kg to Newtons?
N = mgN is weight, in kg-m/s^2 (abbreviated as Newtons (N))m is mass, in kilograms (kg)g is accelleration due to gravity, in m/s^2.Looking at the expression algebraically, you can see that multiplying m by g yields N. So you multiply mass (kg) by 9.8 m/s^2 to get kg-m/s^2, or weight in Newtons.
