77th percentile.
z = -1.644853 (approx).
2.326
z = 0.5244, approx.
Answer: 0 The z score is the value of the random variable associated with the standardized normal distribution (mean = 0, standard deviation =1). Now, the median and the mean of a normal distribution are the same. The 50 percentile z score = the median = mean = 0.
Right around -1.28
75th percentile.
z = -1.644853 (approx).
z = 1.281551
You need to look up z-score tables.
2.326
It is -1.281551
The top percentile (> 99.86%)
z = 0.5244, approx.
To find what z-score represents the 80th percentile, simply solve for 0.8 = F(z), where F(x) is the standard normal cumulative distribution function. Solving gives us: z = 0.842
it doesn't exist.
A percentile is always between 0% and 100%, never negative.
Answer: 0 The z score is the value of the random variable associated with the standardized normal distribution (mean = 0, standard deviation =1). Now, the median and the mean of a normal distribution are the same. The 50 percentile z score = the median = mean = 0.