Numbers 1, 2, 3, ...49 are written in a 49×49 square and holds: In every pair of cells that are symmetrical with respect to the main diagonal the same numbers are written
In any row and column, all the numbers are distinct.
Find the sum of all the numbers on this diagonal.

Tiffany drives 285,120 feet before lunch and 628,320 feet after lunch. about how many kilometers does she drive all together

What is the number 321,000,000 in scientific notation? also what is the number? ?

Arandomized controlled trial is designed to evaluate the effect of metoprolol in patients with heart failure. while preparing for statistical analysis, the researcher reviews some common types of statistical errors. which of the following statements is true regarding a type i error in a clinical study? a. the study is not significantly powered to detect a true difference between study groups. bthe null hypothesis is true but is rejected in error. c. the null hypothesis is false but is accepted in error. d. type i error is also known as beta and is usually 0.1 or 0.2. e. type i error depends on the study's confidence interval.