In: Statistics and Probability
the time it takes for babies to learn to walk is known to be normal distributed with mean 9 months and standard deviation of 1.5 months. what percent of babies learn to walk.
here in the given question mean = 9-month
standard deviation =1.5 month
we have to find the percentage of babies learn to walk in the
given time between 7.5 months() to
10.5 months(
)
hence,
step 1:
find the z value:i.e.
Z=(X-)/
Hence the percentage of babies to walk in a given interval is =(0.68268*100)= 68.27%