Write 39/40 as a decimal
2 answers:
Answer:
Given: The fraction
The decimal forms of rational number either end or repeat a pattern.
To convert the given fractions to decimals you just divide the top by the bottom or divide the numerator by the denominator.
If the division does not come out, you can stop after a certain number of decimal places and round off that number.
Convert a fraction to decimal :
Since fraction and decimal represent the same things because numbers are not whole numbers.
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Answer:
Step-by-step explanation:
The mean SAT score is , we are going to call it \mu since it's the "true" mean
The standard deviation (we are going to call it ) is
Next they draw a random sample of n=70 students, and they got a mean score (denoted by ) of
The test then boils down to the question if the score of 613 obtained by the students in the sample is statistically bigger that the "true" mean of 600.
- So the Null Hypothesis
- The alternative would be then the opposite
The test statistic for this type of test takes the form
and this test statistic follows a normal distribution. This last part is quite important because it will tell us where to look for the critical value. The problem ask for a 0.05 significance level. Looking at the normal distribution table, the critical value that leaves .05% in the upper tail is 1.645.
With this we can then replace the values in the test statistic and compare it to the critical value of 1.645.