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Mathematics

1 answer:

OLEGan [10]2 years ago

6 0

Is there any other answers? To me, none of those look correct. If you had -3 and substituted it into the equation you would get -1(-3)+3, which would turn into 3+3 which equals 6.

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A simple random sample of months of sales data provided the following information: Month Units Sold a. Develop a point estimate

Gnom [1K]

Answer:

a) X[bar]=93

b)S=5.39

Step-by-step explanation:

Hello!

<em>A simple random sample of 5 months of sales data provided the following information: Month: 1 2 3 4 5 Units Sold: 94 100 85 94 92 </em>

<em />

<em>a. Develop a point estimate of the population mean number of units sold per month. </em>

The variable of interest is:

X: Number of sales per month.

A random sample of n=5 months was taken, for each month, the number of units sold was recorded. To calculate the mean of the sample you have to add all the observed frequencies (Units Sold) by the sample size (n)

X[bar]= ∑X/n= 465/5=93

You can say that, on average, 93 units were sold over the 5-month period.

<em>b. Develop a point estimate of the population standard deviation.</em>

To calculate the sample standard deviation you have to calculate the variance and then its square root:

$S^2= \frac{1}{n-1}[sumX^2-\frac{(sumX)^2}{n} ]$

∑X= 465

∑X²= 43361

$S^2= \frac{1}{4}[43361-\frac{(465)^2}{5} ]= 29$

S= √29= 5.385≅ 5.39

I hope this helps!

3 0

3 years ago

The sum of two numbers is 153. if four times the smaller number is subtracted from the larger number, the result is 18. find th

sleet_krkn [62]

X = larger number and y = smaller number

x + y = 153....x = 153 - y
x - 4y = 18

153 - y - 4y = 18
153 - 5y = 18
-5y = 18 - 153
-5y = -135
y = -135/-5
y = 27 <=== smaller number

x - 4y = 18
x - 4(27) = 18
x - 108 = 18
x = 18 + 108
x = 126 <== larger number

4 0

3 years ago

Find the smallest square number divisible by each of these numbers 6,9,and 15

STALIN [3.7K]

Answer:

$\frac{6}{3} = 2$