medium · SAT Math

A hospital surveyed all 250 staff in its Nursing and Administration departments about their preferred work shift. The results are shown in the two-way table below (counts of staff). Day Night Total Nursing 70 105 175 Administration 45 30 75 Total 115 135 250 If one staff member is selected at random from the Nursing department, what is the probability that this staff member's preferred shift is Night?

1. 0.4
2. 0.42
3. 0.6
4. 0.778

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