Combined Mean and Variance

JEE Main Mathematics · Statistics · 5 questions, latest first

• A set of four observations has mean 1 and variance 13. Another set of six observations has mean 2 and variance 1. Then, the…20268 April, Shift 2 · Q7
• Let sets A and B have 5 elements each. Let the mean of the elements in sets A and B be 5 and 8 respectively and the variance of…202311 April, Shift 1 · Q18
• The mean and variance of a set of 15 numbers are 12 and 14 respectively. The mean and variance of another set of 15 numbers are…20236 April, Shift 1 · Q17
• Let the mean and standard deviation of marks of class A of 100 students be respectively 40 and α (> 0 ), and the mean and…202331 January, Shift 2 · Q79
• Let X={11,12,13, …, 40,41} and Y={61,62,63, …, 90,91} be the two sets of observations. If x̄ and ȳ are their respective means…202329 January, Shift 2 · Q90