Answer:
![\=x=82](https://tex.z-dn.net/?f=%5C%3Dx%3D82)
Step-by-step explanation:
From the question we are told that:
Data
![\begin{center}\begin{tabular}{ |c|c|c|c|c|c| } 87& 91& 86& 82& 72&91 \\ 60& 77& 80& 79& 83&96 \end{tabular}\end{center}](https://tex.z-dn.net/?f=%5Cbegin%7Bcenter%7D%5Cbegin%7Btabular%7D%7B%20%7Cc%7Cc%7Cc%7Cc%7Cc%7Cc%7C%20%7D%20%2087%26%2091%26%2086%26%2082%26%2072%2691%20%5C%5C%2060%26%2077%26%2080%26%2079%26%2083%2696%20%5Cend%7Btabular%7D%5Cend%7Bcenter%7D)
Generally the equation for Point estimate
is mathematically given by
![\=x=\frac{\sum_x}{n}](https://tex.z-dn.net/?f=%5C%3Dx%3D%5Cfrac%7B%5Csum_x%7D%7Bn%7D)
![\=x=\frac{87 +91+ 86+ 82 +72 +91+ 60+ 77 +80+ 79+ 83 +96}{12}](https://tex.z-dn.net/?f=%5C%3Dx%3D%5Cfrac%7B87%20%2B91%2B%2086%2B%2082%20%2B72%20%2B91%2B%2060%2B%2077%20%2B80%2B%2079%2B%2083%20%2B96%7D%7B12%7D)
![\=x=\frac{984}{12}](https://tex.z-dn.net/?f=%5C%3Dx%3D%5Cfrac%7B984%7D%7B12%7D)
![\=x=82](https://tex.z-dn.net/?f=%5C%3Dx%3D82)
Answer:
D (3,1)
Step-by-step explanation:
solving simultaneous equations
Arrange equations
2x+y=7
3x-4y=5
make y side cancell by addition by multiplying by 4 and 1 as shown
4{2x+y=7}
1{3x-4y=5}
8x+4y=28
3x-4y=5
11x=33
x=33/11=3
substitute for x=3 in 3x-4y=5
9-4y=5
4=4y
y=1
Answer: k=225/2
Decimal form: k= 112.5
Mixed number form: k=112 1/2