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3 years ago

9

Helpppp plsssssss!!!!!!!!!

1 answer:

zavuch27 [327]3 years ago

5 0

I think it’s A not sure tho

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Sierra walks her dog Pepper twice a day. Her evening walk was two and a half miles. At the end of the day, she tells her mom,

zepelin [54]

Answer:

1.2 miles

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Ava flipped a coin 2 times. What are all the possible outcomes in the sample space? Let T represent the coin landing tails up an

Karo-lina-s [1.5K]

Answer:

HH TT HT TH

Step-by-step explanation:

My extremely bad makeshift tree diagram:

the first column is our first flip, second column is our second

H

H-

T

possible outcomes -

H

T -

T

3 0

3 years ago

Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sampl

kompoz [17]

Complete Question

Statistics professors believe the average number of headaches per semester for all students is more than 18. From a random sample of 15 students, the professors find the mean number of headaches is 19 and the standard deviation is 1.7. Assume the population distribution of number of headaches is normal.the correct conclusion at $\alpha =0.001$ is?

Answer:

There is no sufficient evidence to support the professor believe

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 18$

The sample size is $n = 15$

The sample mean is $\= x = 19$

The standard deviation is $\sigma = 1.7$

The level of significance is $\alpha = 0.001$

The null hypothesis is $H_o: \mu = 18$

The alternative hypothesis is $H_a : \mu > 18$

The critical value of the level of significance from the normal distribution table is

$Z_{\alpha } = 3.290527$

The test hypothesis is mathematically represented as

$t = \frac{\= x - \mu }{ \frac{\sigma}{ \sqrt{n} } }$

substituting values

$t = \frac{ 19 - 18}{ \frac{1.7}{ \sqrt{15} } }$

$t = 2.28$

Looking at the value of t and $Z_{\alpha }$ we can see that $t < Z_{\alpha }$ so we fail to reject the null hypothesis.

This mean that there is no sufficient evidence to support the professor believe

3 0

4 years ago

Can someone help me solve this need help on this ASAP

Nezavi [6.7K]

<h3>Given : </h3>

Radius of circle = 7 inches

<h3>To Find : </h3>

Circumference of circle = ?

<h3>Solution :</h3>

We are given radius, r = 7 inches

We know that :

Circumference = 2πr

⟹ Circumference = 2π × 7 inches

⟹ Circumference = 14π inches

Hence, circumference of circle is 14π inches.

3 0

3 years ago

There are 15 students going on a field trip. If 3/5 of them pack there lunches, how many students pack their lunches?

valentinak56 [21]

Answer:

9 pack their lunches

Step-by-step explanation:

Take the number of students and multiply by the fraction that pack their lunches

15 *3/5 =

15/5 * 3

3*3

9

6 0

3 years ago