1 of 8 0-day streak

Experimental probability from observed frequencies

Question 1 of 8

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A marble was selected and replaced for each trial. The results from 50 trials are shown in the table

Any category not listed had zero recorded results in this run

Let \(A\) be the event that the result is black

(a)1 mark

Find the relative frequency of trials where the result is black in the table

Experimental probability

Format: exact fraction or terminating decimal

(b)1 mark

Which statement correctly interprets the experimental probability for A from this run?

The favourable count itself is the probability; no division by the trial count is needed

The observed estimate uses all 50 trials to estimate the probability that the result is black. A different run may give a different estimate

The probability uses the number of result categories as its denominator, regardless of how many trials were recorded