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Licemer1 [7]
3 years ago
10

Maryann went to a beauty store and bought 3 hair brushes for $12 and 2 hair straighteners for $70. Write an expression that can

be used to find the total amount that Maryann spent at the store. Then solve the expression.
Mathematics
1 answer:
svetoff [14.1K]3 years ago
7 0

Answer:

$176

Expression: (12*3)+(70*2)

Step-by-step explanation:

The 3 hair brushes: $12*3= $36

The 2 hair straighteners: $70*2=$140

$140+$36=$176

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The proportion of students at a college who have GPA higher than 3.5 is 19%. a. You take repeated random samples of size 25 from
melomori [17]

Answer:

\mu_{\hat{p}}=0.19

\sigma_{\hat{p}}=0.0785

Step-by-step explanation:

We know that the mean and the standard error of the sampling distribution of the sample proportions will be :-

\mu_{\hat{p}}=p

\sigma_{\hat{p}}=\sqrt{\dfrac{p(1-p)}{n}}

, where p=population proportion and n= sample size.

Given : The proportion of students at a college who have GPA higher than 3.5 is 19%.

i.e. p= 19%=0.19

The for sample size n= 25

The mean and the standard error of the sampling distribution of the sample proportions will be :-

\mu_{\hat{p}}=0.19

\sigma_{\hat{p}}=\sqrt{\dfrac{0.19(1-0.19)}{25}}\\\\=\sqrt{0.006156}=0.0784601809837\approx0.0785

Hence , the mean and the standard error of the sampling distribution of the sample proportions :

\mu_{\hat{p}}=0.19

\sigma_{\hat{p}}=0.0785

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Read 2 more answers
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