CUET Mathematics 2026 25th May Shift 1 PYQs

The monthly sales of a plywood shop are normally distributed with a standard deviation of ₹900. A statistical study of sales in the last nine months has found a confidence interval for the mean monthly sales with extremes ₹4663 and ₹5839. What were the average sales over the nine-month period?

Which of the following statements are TRUE?

(A) The variable t of t-distribution ranges from $-\infty$ to $\infty$.

(B) The probability curve of the t-distribution is symmetric about the line $t=0$

(C) The variance of the t-distribution is greater than one.

(D) As the number of degrees of freedom decreases, the t-distribution curve moves closer to the standard normal probability curve.

Choose the correct answer from the options given below:

The following data are from a simple random sample: $6, 8, 11, 9, 15, 17$, then the point estimate of the population mean is