Probability

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#1
The probability that Saira walks to school is 0.8
If Saira walks to school, the probability that she will be late is 0.3
If Saira does not walk to school, the probability that she will be late is 0.05
Work out an estimate for the number of days that Saira will be late on the next 20 school days
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3 weeks ago
#2
(Original post by confusedgcses)
The probability that Saira walks to school is 0.8
If Saira walks to school, the probability that she will be late is 0.3
If Saira does not walk to school, the probability that she will be late is 0.05
Work out an estimate for the number of days that Saira will be late on the next 20 school days
Use a tree diagram to work out the probability that she is late on any given day (either walks and late, or doesn't walk and late, added together).
2
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