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3 years ago

At a candy store, 3 giant lollipops sell for $7.59 and 2 small packets of bubblegum cost $4.82. Which is a better buy?

Mathematics

1 answer:

galben [10]3 years ago

3 0

2 small backs of bubble gum is your answer because it costs less!!

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marian is a sprinter, running short distances on the track team. she wants to find how fast she runs in miles per hour. what uni

Annette [7]

Meters and seconds.

Most short distance races involve meters and the timing is usually in seconds. She can use the information and convert it to miles per hour.

6 0

2 years ago

A study claims that college students spend an average of 4 hours or less studying per day. A researcher wants to check if this c

kirill115 [55]

<h2>Answer with explanation:</h2>

Let $\mu$ be the population mean.

By observing the given information, we have :-

$H_0:\mu\leq4\\\\H_a:\mu>4$

Since the alternative hypotheses is left tailed so the test is a right-tailed test.

We assume that the time spend by students per day is normally distributed.

Given : Sample size : n=121 , since n>30 so we use z-test.

Sample mean : $\overline{x}=3.15$

Standard deviation : $\sigma=1.2$

Test statistic for population mean :-

$z=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

$\Rightarrow\ z=\dfrac{3.15-4}{\dfrac{1.2}{\sqrt{121}}}\\\\\Rightarrow\ z=-7.79166666667\approx-7.79$

Critical value (one-tailed) corresponds to the given significance level :-

$z_{\alpha}=z_{0.1}=1.2816$

Since the observed value of z (-7.79) is less than the critical value (1.2816) , so we do not reject the null hypothesis.

Hence, we conclude that we have enough evidence to accept that the college students spend an average of 4 hours or less studying per day.

4 0

2 years ago

I'm stuck, plsss help ASAPP!!! :))

Bogdan [553]

Answer:

15 units

Step-by-step explanation:

$d \: = \sqrt{(x2 - x1) ^{2} + (y2 - y1) ^{2} }$

d = 14.866

d = 15

7 0

3 years ago

In a chemical compound there are three parts zinc for every 16 parts copper by mass. A piece of the compound contains 320 g of c

Orlov [11]

<span>Total mass contains 320g copper. How many parts of 16g copper are there of the total mass of 320g copper? 320/16 = 20. There are 20 portions of 16g copper. (320/16) * 3 = 60g There are 60g of zinc in the compound.</span>

6 0

3 years ago

What is the proper mathematical definition of "square root?"

pogonyaev

The square root<span> of a number is a value that, when multiplied by itself, gives the number.</span><span> </span>

6 0

2 years ago