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3 years ago

What is -7-4p-(-5) ??

2 answers:

Pie3 years ago

7 0

Let's simplify step-by-step. −7−4p−(−5)
 =−7+−4p+5
 Combine Like Terms: =−7+−4p+5=(−4p)+(−7+5)=−4p+−2Answer:=−4p−2

Oxana [17]3 years ago

5 0

-7-4p-(-5) = -7+5-4p = -2-4p = -1-2p

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3 years ago

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SpyIntel [72]

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Step-by-step explanation:

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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] ± $t_{n-1;1-\alpha /2} * \frac{S}{\sqrt{20} }$

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[15.3 ± 2.093 * $\frac{6.8}{\sqrt{20} }$ ]

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I hope it helps!

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