I am having some troubles with interpreting the significance of mean.

Mean= 0.19609

St. Dev=0.12341

n=141

I get t-statistic of 18.86763( ratio mean/ st. error)

I thought that for the mean to be significant and expected (not abnormal) t-stat has to be within the interval -1.645<t<1.645 with 95% level of confidence.. or am I wrong?

How do I explain enormous t-statistic, does it make any sense at all?

Thank you