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skelet666 [1.2K]

3 years ago

8

Linda planned to spend 9 hours practicing piano this week. By tuesday,she had spent 2 1/2 hours practising. How much longer does

she need to practice to reach her goal?

1 answer:

faust18 [17]3 years ago

5 0

Just subtract 9:00-2:30 so your answer should 6 hours and 30 minutes or 6 1/2 hours

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How much TV do college students watch? A survey of 361 students recorded the number of hours of television they watched per week

Darina [25.2K]

Answer: 90% confidence interval would be (6.022,6.986).

Step-by-step explanation:

Since we have given that

Number of students = 361

Sample mean = 6.504

Sample standard deviation = 5.584

Standard error of the mean = 0.294

At 90% confidence level,

So, α = 0.01

So, z = 1.64

Margin of error is given by

$z\times \text{Standard error}\\\\=1.64\times 0.294\\\\=0.48216$

So, Lower limit would be

$\bar{x}-0.482\\\\=6.504-0.482\\\\=6.022$

Upper limit would be

$\bar{x}+0.482\\\\=6.504+0.482\\\\=6.986$

So, 90% confidence interval would be (6.022,6.986).

3 0

3 years ago

Solve for x. -2(16 - 4x) - 8 = 6(x + 2)

Amanda [17]

So...

-2(16-4x)-8=6(x+2)            Multiply
-32+8x-8=6x+12                 Add like terms
-40+8x=6x+12                    Subtract 6x from both sides
-40+2x=12                          Add 40 to both sides
2x=52                                 Divide 2 from both sides
x=26                                   Substitute to check
-2(16-4(26))-8=6((26)+2)   Add and multiply in parenthesis
-2(-88)-8=6(28)                  Multiply
176-8=168                         Subtract
168=168

So x=26

I hope this helps! Have a great day!

6 0

4 years ago

The owners of a large pet store have determined that 65\ee, percent of their customers own dogs. They select 151515 customers at

crimeas [40]

Answer:

D is a binomial random variable with $p = 0.65, n = 15$

Step-by-step explanation:

For each customer, there are only two possible outcomes. Either they have dogs, or they do not. The probability of a customer having a dog is independent of any other customer. This means that D is a binomial random variable.

Binomial probability distribution

Probability of exactly x successes on n repeated trials, with p probability.

65% of the customers have dogs:

This means that $p = 0.65$

15 customers:

This means that $n = 15$

What type of variable is D?

D is a binomial random variable with $p = 0.65, n = 15$

5 0

3 years ago

-5(k-6) - 7(2k+3)<br> Can some one plz help me with this i nedz help plz help me.

Sholpan [36]

-19x+9 is the answer
First distribute -5 and -7 once you that you’ll get -5x+30 and -14x-21 so now you have -5x+30-14x-21 you then are gonna combine like terms so -5x-14x is -19x and 30-21 is 9 and so you’ve simplified all you can and end up with -19x+9

7 0

4 years ago

Read 2 more answers

Helpppp me plz i need help

daser333 [38]

Answer:

The answer is D

Step-by-step explanation:

I learned this in school

6 0

3 years ago