Median is middle number of a data set. If a data set has an odd number of numbers then the median is the middle number when ordered form least to greatest but if its an even number you have to find the mean for the middle 2 numbers when ordered for least to greatest.
A.
1.2, 2.4, 3.2, 3.2, 3.6, 4.0, 4.1, 4.7
Even numbers = 8 3.2 + 3.6 = 6.8 6.8 ÷ 2 = Median = 3.4 So this shows that A isn't the answer because the median of A is 3.4, not 3.2.
B.
1.6, 2.8, 2.9, 3.1, 3.3, 3.6, 4.2, 4.5
Even numbers = 8 3.1 + 3.3 = 6.4 6.4 ÷ 2 = 3.2 Median = 3.2 <span>So this shows that B is the answer because the median of B is 3.2.
C.
1.8, 2.0, 2.0, 2.2, 3.2, 4.7, 4.8, 4.9 </span> Even numbers = 8 2.2 + 3.2 = 5.4 5.4 ÷ 2 = 2.7 Median = 2.7 <span>So this shows that C isn't the answer because the median of C is 2.7, not 3.2. </span> D.
7] 6/(x-1)-5x/4 subtracting the above we put the fraction under the same denominator: 6/(x-1)-5x/4 multiplying the denominators we get: 4(x-1) thus subtracting we get: 6/(x-1)-5x/4 =(4*6-5x(x-1))/[4(x-1)] =[24-5x^2+5x]/(4x-4) Answer: (-5x^2+5x+24)/(4x-4)
9] 3/(x+7)+4/(x-8) the common denominator is: (x+7)*(x-8)=(x+7)(x-8) thus adding the fractions we put them under the same denominator as follows: [3(x-8)+4(x+7)]/[(x+7)(x-8)] =[3x-24+4x+28]/[(x+7)(x-8)] =(7x+4)/[(x+7)(x-8)]