List of top Applied Mathematics Questions on Statistics asked in CBSE CLASS XII

Given that the mean of a normal variate $X$ is 9 and standard deviation is 3, then find:
(i) the z-score of the data point 15
(ii) the data point if its z-score is 4
The test statistic $t$ for testing the significance of differences between the means of two independent samples is given by
The variations which occur due to change in climate, festivals or weather conditions are known as
The mean of $t$-distribution is