The heights of 6 girls in a group are 142cm, 150cm, 154cm, 146cm, X cm, 148cm and their average height is 147 cm.Then find the value of ‘X’.
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Answer:
Mean of heights of 6 girls = 148cm
Let the height of 6th girl be x
Mean = Sum of heights / No. of girls
148 = 142+154+146+145+150+x / 6
148 = 737+x / 6
737+x = 148 X 6 = 888
737+x = 888
x = 888-737 = 151
Height of 6th girl = 151cm
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Step-by-step explanation:
Mean of the height s of six girls = 148 cm. <br> Sum of the heights of six girls =
= 888 cm <br> Sum of the heights of the five grils <br> = (150 +154+146+142+145)cm = 737 cm <br> Height of the sixth girl = (888 -737) cm = 151 cm <br> Hence, the height of the sixth girl is 151 cm .
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