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velikii [3]
3 years ago
5

In a chemistry course, a student scored 99 on one test, 98 on another test, and 88 on each of the other tests. the student’s tes

t average for the course, where each test is weighted equally, is exactly 91. what is the total number of tests that the student has taken in the course?
Mathematics
1 answer:
Alexxandr [17]3 years ago
8 0
The student took 7 tests. 

99+98+88+88+88+88+88 = 637


637/7 = 91
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Write the slope-intercept form of the equation of each line
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Answer:

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Step-by-step explanation:

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A. 71<br><br> B. 84<br><br> C. 29<br><br> D. 67
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Step-by-step explanation:

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3 years ago
The weights of the apples grown on an orchard are normally distributed. The mean weight has been m0 = 9.500 ounces. Because of t
diamong [38]

Answer:

t(s) is in rejection zone then we reject H₀.

Bad weather indeed make apples weight decrease

Step-by-step explanation:

Normal Distribution

population mean    μ₀   = 9.5 ou

sample size   =  n   =  16  then we should apply t-student table

degree of fredom   df  =  n  - 1     df =  16  -  1    df  = 15

1.-Test  hypothesis

H₀     null  hypothesis                          μ₀   =  9.5    

Hₐ alternative hypothesis                   μ₀  <  9.5

One left tail-test

2.-Confidence level 95 %

α  =  0,05    and   df  = 15    from t-student table we get  t(c)  =  - 1.761

3.-Compute t(s)  

t(s)  =  [ μ  -  μ₀  ] /√s/n         t(s)  = (9.32  -  9.5 )* √16 / 0.18

t(s)  = -  0.18*√16 / 0.18

t(s)  = - 4

4.-Compare  t(s)   and t(c)

t(s) < t(c)     -4  <  - 1.761

Then  t(s)  is in the rejection zone.

5.- Decision

t(s) is in rejection zone then we reject H₀.

Farmer conclude that bad weather make apples weight decrease

6 0
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