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3 years ago

Achemistry student atrwered 81 questions correctly on a 90-question test. What

Mathematics

1 answer:

ludmilkaskok [199]3 years ago

4 0

Answer:

The student got 90% correct and 10% incorrect.

Step-by-step explanation:

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A random sample of 12 students used Method A, and their increase in points averaged 46.31, with a sample standard deviation of 6

Kitty [74]

Answer:

The null hypothesis is $H_o : \mu_A - \mu_B = 0$

The alternative hypothesis is $H_a : \mu_A - \mu_B > 3$

Step-by-step explanation:

From the question we are told that

The mean of method A is $\mu_A = 46.31$

The standard deviation of method A is $\sigma = 6.44$

The mean of method B is $\mu_B = 42.79$

The standard deviation of method B is $\sigma_B = 7.52$

An appropriate set of null and alternative hypothesis to determine whether Method A increases students points by more than 3 points is

The null hypothesis is $H_o : \mu_A - \mu_B = 0$

The alternative hypothesis is $H_a : \mu_A - \mu_B > 3$

6 0

3 years ago

A studio is buying four (4) MP3 players for $129.55 each. Estimate the least number of $100 bills needed to buy the MP3 players.

Dahasolnce [82]

Answer:

6 bills

Step-by-step explanation:

129.55*4 = $518.20

you have to round up since it is over $500 so its 6 $100 bills

8 0

3 years ago

Read 2 more answers

F(x) = -55x/x^3+5x^2-24x

Naddik [55]

Answer:

5x^4-24x^3-55/x^2

Step-by-step explanation:

I have the solution in my notes but it's too long✌️

4 0

3 years ago

PLEASE HELP ME WITH THIS

evablogger [386]

I think The answer is b. 17

8 0

4 years ago

Read 2 more answers

Solve 2/3x -1/5> 1 <br><br> x>

vaieri [72.5K]

Answer:

Step-by-step explanation:

x>9/5

5 0

3 years ago