Is data comes from a normal distribution? i am new in statistics but what i learn i can say because points between third and first quantile lie on the qqline. But one thing that confuses me is that boxplot of the (quantile plot data where an outliers is also) has larger whisker to the down side then upside but median lies in center. can someone tell me if data comes from normal distribution?
Your data are probably not exactly normally distributed because few real-world datasets are. However, your question might be better understood as "Are my data normal enough?" The answer depends on the purposes for which you wish to assume a normal distribution, but even without knowing your purpose (you get better answers if you give more detail) I can say from the Q-Q plots that your data are probably normal enough. For many purposes the central limit theorem will negate the influence of minor departures from normality when you are focussed on the mean and when you have lots of data.
This question has an answer that may also be of interest to you: Normality test before testing the difference between two groups. Is it necessary?
(Your confusion seems to relate to the whiskers of the boxplot. That is understandable given that Tukey presented about half a dozen variants of boxplots in the germinal paper and given that there seems to be little consistency in the variants used. However, searching for box and whisker plots on this site will probably help you.)
