The table below shows the scores of 40 students in a Mathematics test.

Scores: 10-19 20-29 30-39 40-49 50-59 60-69 70-79
Frequency: 3 5 7 10 8 5 2

(a) Calculate the mean score of the distribution.
(b) Calculate the standard deviation of the distribution.
(c) What is the probability that a student selected at random scored at least 50 marks?

Question

The table below shows the scores of 40 students in a Mathematics test.

Scores:    10-19  20-29  30-39  40-49  50-59  60-69  70-79
Frequency:   3      5      7      10      8      5      2

(a) Calculate the mean score of the distribution.
(b) Calculate the standard deviation of the distribution.
(c) What is the probability that a student selected at random scored at least 50 marks?

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Answer

A) null

Answer

B) null

Answer

C) null

Answer

D) null

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