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प्रश्न
The heights of 9 persons are 142 cm, 158 cm, 152 cm, 143 cm, 139 cm, 144 cm, 146 cm, 148 cm and 151 cm. Find the mean height.
उत्तर
The heights are:
142 cm, 158 cm, 152 cm, 143 cm, 139 cm, 144 cm, 146 cm, 148 cm, 151 cm
n=9
`barx = (x_1 + x_2 + x_3 + .... + x_n)/n`
`barx = (142 + 158 + 152 + 143 + 139 + 144 + 146 + 148 + 151 )/9`
`barx = 1323/9`
`barx = 147 "cm" `
The mean height = 147 cm
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