Mathematics
17.08.2022 16:44
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In a class of 23 students, 16 have a brother and 15 have a sister. There are 11
In a class of 23 students, 16 have a brother and 15 have a sister. There are 11 students
who have a brother and a sister. What is the probability that a student chosen
randomly from the class is an only child?
Show Answers
randomly from the class is an only child?
samflores236
4,8(21 marks)
3/23
Step-by-step explanation:
11 students have a brother and a sister16 students have a brother and 16 - 11 = 5 have a brother only15 students have a sister and 15 - 11 = 4 have a sister onlySo out of 23 students:
11 + 5 + 4 = 20 have a brother or sister or bothAnd therefore
23 - 20 = 3students have no brothers or sisters
The required probability is:
3/23
eternity88091
4,6(36 marks)
7% of 4700 = 329
740 x 6 = 4440
Total cost = 329 + 4440 = 4769
The extra cost of instalments = 69
740 x 6 = 4440
Total cost = 329 + 4440 = 4769
The extra cost of instalments = 69
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