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zavuch27 [327]
3 years ago
10

Betty Learned how to play a total of 14 songs over the course of 7 weeks of piano lessons.In all, how many weeks of piano lesson

s will Betty need before she be able to play a total of 36 songs? Solve using unit rates.​
Mathematics
1 answer:
galina1969 [7]3 years ago
5 0

Answer:

18 weeks

Step-by-step explanation:

14 songs / 7 weeks

2 songs per week

36 songs * 1 week/ 2 songs

36 /2 weeks

18 weeks

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A city planner would like to estimate the true mean annual income of all households in the city. She selects a random sample of
Bumek [7]

Answer:

If many random samples of size 50 are selected from all households in the city, approximately 99% of the intervals would capture the true mean household income.

Step-by-step explanation:

EDGE2021

6 0
3 years ago
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
I really need help!! can u pwease help ;-;
Nata [24]

Answer:

b

Step-by-step explanation:

6 0
3 years ago
Find the value of n<br><br> 6/n = 5/120
sleet_krkn [62]

Answer:

n = 144

Step-by-step explanation:

          6 / n = 5/120

         6 * 120 = 5*n

               5n = 6*120

               5n = 720

                 n = 720/5

                 n = 144

8 0
3 years ago
Read 2 more answers
yuna missed 5 points out of 100 points on her test. what decimal number represents the part of her math test that she answers co
valkas [14]
95/100 = 0.95 <== if she missed 5 out of 95, then she got 95 out of 100
6 0
3 years ago
Read 2 more answers
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