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slavenkaitlynn
06.04.2021 •
Mathematics
For boys, the average number of absences in the first grade is 14 with a standard deviation of 4; for girls, the average number of absences is 9 with a standard deviation of 3. In a nationwide survey, suppose 100 boys and 64 girls are sampled. What is the probability that the male sample will have 4 to 6 more days of absences than the female sample? Round your answers to 4 decimal places.
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Ответ:
The simplified expression is
20x^2 - 33x - 27
Step-by-step explanation:
(6x - 9 - 2x)(8 + 5x - 5)
We must first rewrite the expression as a product of two binomials.
This can be done by adding like terms
(6x - 9 - 2x)(8 + 5x - 5)
We have,
(4x-9)(5x+3)
Multiplying the resulting binomial expression
(4x-9)(5x+3)
(20x^2+12x-45x-27)
Add the like terms
20x^2-33x-27
The simplified expression is
20x^2 - 33x - 27
Twenty x squared minus thirty-three x minus twenty-seven