medium · GMAT Quant
A supermarket has three types of checkout lanes: Standard, Express, and Self-checkout. Standard lanes handle 50 percent of transactions, Express lanes 30 percent, and Self-checkout lanes 20 percent. The probability of a scanning error is 0.03 in Standard, 0.02 in Express, and 0.05 in Self-checkout.
What is the probability that a randomly selected transaction has a scanning error?
- 0.031
- 0.033
- 0.100
- 0.030
- 0.028
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