58% A group of students were given a spelling test.
The table shows their marks.
Mark
Frequency
6
5
4
a) Work out the range of the marks.
7
8
7
b) How many students are in the group?
9
10
10
4
c) Work out the mean mark of the group.
what is the mean

In which of the situations can information about tyler be represented by the expression r+3 when r represents information about ray? check all that apply.

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)