Basic Math Examples

81

$81$ ,

83

$83$ ,

69

$69$ ,

71

$71$ ,

74

$74$ ,

67

$67$ ,

85

$85$ ,

74

$74$ ,

73

$73$ ,

68

$68$ ,

73

$73$ ,

78

$78$ ,

80

$80$ ,

89

$89$ ,

75

$75$

Step 1

The mean of a set of numbers is the sum divided by the number of terms.

\frac{81 + 83 + 69 + 71 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}

$\frac{81 + 83 + 69 + 71 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2

Simplify the numerator.

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Step 2.1

Add

81

$81$ and

83

$83$ .

\frac{164 + 69 + 71 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}

$\frac{164 + 69 + 71 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.2

Add

164

$164$ and

69

$69$ .

\frac{233 + 71 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}

$\frac{233 + 71 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.3

Add

233

$233$ and

71

$71$ .

\frac{304 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}

$\frac{304 + 74 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.4

Add

304

$304$ and

74

$74$ .

\frac{378 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}

$\frac{378 + 67 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.5

Add

$378$ and

$67$ .

$\frac{445 + 85 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.6

Add

$445$ and

$85$ .

$\frac{530 + 74 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.7

Add

$530$ and

$74$ .

$\frac{604 + 73 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.8

Add

$604$ and

$73$ .

$\frac{677 + 68 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.9

Add

$677$ and

$68$ .

$\frac{745 + 73 + 78 + 80 + 89 + 75}{15}$

Step 2.10

Add

$745$ and

$73$ .

$\frac{818 + 78 + 80 + 89 + 75}{15}$

Step 2.11

Add

$818$ and

$78$ .

$\frac{896 + 80 + 89 + 75}{15}$

Step 2.12

Add

$896$ and

$80$ .

$\frac{976 + 89 + 75}{15}$

Step 2.13

Add

$976$ and

$89$ .

$\frac{1065 + 75}{15}$

Step 2.14

Add

$1065$ and

$75$ .

$\frac{1140}{15}$

Step 3

Divide

$1140$ by

$15$ .

$76$