if the points of inflexion of a normal curve are 40 and 60 respectively, then it's mean deviation is a) 40 b)45 c)50 d)60
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Mean = 50
Step-by-step explanation:
the points of inflexion of a normal curve are are at 1 Standard deviation away from Mean
points of inflexion of a normal curve = Mean ± Standard Deviation
Mean + Standard Deviation = 60
Mean - Standard Deviation = 40
Adding Both => 2 * Mean = 100
=> Mean = 50
50 + Standard Deviation = 60
=> Standard Deviation = 10
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