Given mean, variance and number of buckets, find histogram bucket boundaries

I need to find the bucket boundaries of the histograms when user inputs mean, variance and number of buckets for a standard normal distribution in addition to generating the distribution values.

I am using java nextGaussian() to generate the normal distribution values, but I am not sure how to get the bucket boundaries so that the histogram shape would look like a normal distribution.

Any help appreciated.

Thanks!