A teacher records the marks scored by 30 students in an English test. Mark Frequency

1−5 1

6−10 4

11−15 6

16−20 6

21−25 8
26−30 5

a Calculate an estimate of the mean score.

Give your answer to 1 decimal place.

Which equation represents the partial sum of the geometric series?

List the sides of δrst in ascending order (shortest to longest) if: m∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula , what is the temperature in celsius corresponding to r degrees rankine? a. 9/5(c - 273) b. 9/5(c + 273) c. 5/9( c - 273) d. 5/9( c + 273)