for the question. 19. Solve this equation: 80 = 3y + 2y + 4 + 1. A. y = 15 B. y = 75 C. y = –15 D. y = 1/5

Mathematics

2 answers:

Scorpion4ik [409]3 years ago

3 0

80 = 3y+ 2y+4+1
Simplfy like terms:
80 = 5y + 5
-5 -5
75 = 5y
5 5
y = 15
The answer is A. hope this helps

olganol [36]3 years ago

3 0

$3y + 2y = 5y \\ 4 + 1 = 5 \\ 80 = 5y + 5 \\ 80 - 5 = 75 \\ 75 \div 5y = 15 \\ y = 15$

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Answer:

t = -1.428

Step-by-step explanation:

Average blood pressure among people with high responsibility jobs = u = 140 mm

Number of people sampled for the study = n = 51

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Standard deviation of the sample = s = 5 mm

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Null Hypothesis: $\mu \geq 140$

Alternate Hypothesis: $\mu < 140$

Since population standard deviation is not known, we cannot use z-distribution for this test. We are given the value of sample standard deviation, so t-test will be used for this case.

Test statistic is calculated as:

$t=\frac{x-u}{\frac{s}{\sqrt{n} } }$