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nydimaria [60]
3 years ago
12

In a school of 1800 students, the ratio of teachers to students is 1:20. Some teachers join the school and the ratio changes to

1:18. Find the number of teachers who joined the school.
PLEASE IMA GET A EMAIL HOME!!!
Mathematics
1 answer:
blagie [28]3 years ago
4 0

Answer:

10 teachers

Step-by-step explanation:

Looking at the data provided, we can conclude that for 1800 students, there are 90 teachers.

1:20

When more teachers arrive, it then becomes, for every 1800 students, there are 100 teachers.

1:18

10 more teachers have now joined the school.

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Step-by-step explanation:

Data given and notation

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Alternative hypothesis:\mu > 210250  

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We don't know the population deviation, so for this case is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:  

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Now we need to find the degrees of freedom for the t distirbution given by:

df=n-1=5-1=4

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If we compare the p value and a significance level assumed \alpha=0.1 we see that p_v so we can conclude that we reject the null hypothesis, and the actual true mean is higher than 210250 at 5% of significance.  

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