Sofia has a bag containing 8 blue beads and 7 red beads only. She takes one bead out of the bag at random and replaces it. She does this 90 times. Find the number of times she expects to take a red bead.
Exam No：0580_s20_qp_23 Year：2020 Question No：5
Answer:
42
Knowledge points:
E8.1 Calculate the probability of a single event as either a fraction, decimal or percentage. (Problems could be set involving extracting information from tables or graphs.)
E8.4.1 Understand relative frequency as an estimate of probability.
E8.4.2 Expected frequency of occurrences.
Solution:
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