Bx^(2)+2b^(2)-b^(3)-2x^(2)
1 answer:
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Divide the total amount of keys produced by the amount of keys a piano requires to find the amount of pianos a factory made:
The factory made 6204 pianos in 12 months.
Because the question asks for the amount of pianos made for the first 3 months, we'll divide the total 12 months by the 3 months the question asks for:
Now we'll divide the total amount of pianos made in 12 months by this number to find the pianos made in 3 months:
1551 pianos were made in the first 3 months of production.
The factory made 6204 pianos in 12 months.
Because the question asks for the amount of pianos made for the first 3 months, we'll divide the total 12 months by the 3 months the question asks for:
Now we'll divide the total amount of pianos made in 12 months by this number to find the pianos made in 3 months:
1551 pianos were made in the first 3 months of production.
Answer:
c. (12.12, 18.48)
Step-by-step explanation:
Hello!
The study variable is X: number of times a racehorse is raced during its career.
The average number is X[bar]= 15.3 and the standard deviation is S= 6.8 obtained from a sample of n=20 horses.
To estimate the population mean you need that the variable has a normal distribution, in this case, we have no information about its distribution so I'll assume that it has a normal distribution. With n=20 the most accurate statistic to use for the estimation is a Students-t for one sample, the formula for the interval is:
X[bar] ±
[15.3 ± 2.093 * ]
[12.12; 18.48]
Using a significance level of 95% you'd expect that the true average of times racehorses are raced during their career is included in the interval [12.12; 18.48].
I hope it helps!