Question

# mu=50, sigma=10 Is the range be approximately 60 if it's normal distribution?

Data distributions
$$\displaystyle\mu={50},\sigma={10}$$
Is the range be approximately 60 if it's normal distribution?

It is, sice most of the values are within $$\displaystyle{3}\sigma$$ of $$\displaystyle\mu$$.
Since this consists of $$\displaystyle{3}\sigma$$ below and $$\displaystyle{3}\sigma$$ above $$\displaystyle\mu$$, the data values are expected to fall in the range of $$\displaystyle{3}\sigma+{3}\sigma={6}\sigma$$.
$$\displaystyle\sigma={10}$$
$$\displaystyle{6}\sigma={6}\times{10}={60}$$