Without using tables, find the value of: \(\frac{sin 20°}{cos 70°} + \frac{cos 25°}{sin 65°}\)

The mean of 20 observations in an experiment is 4. If the observed largest value is 23, find the mean of the remaining observations.

Two fair dice are tossed together once. Find the probability that the sum of the outcomes is at least 10.

Find the median of the following numbers: 2.64, 2.50, 2.72, 2.91, and 2.35

From a box containing 2 red, 6 white, and 5 black balls, a ball is randomly selected. What is the probability that the selected ball is black?