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3 years ago

John ran 4 laps of the track in 5 minutes, 40 seconds

2 answers:

mihalych1998 [28]3 years ago

7 0

Well, lets think about this. We need to ask our self how many seconds are in one minute. There are 60 seconds in 1 minute. We know he did 4 laps in 5 minutes and 40 seconds. You can change the minutes to seconds by multiplying 60 * 5 = 300 seconds. So 5 minutes = 300 seconds. Now just take the 40 seconds and add it to the 300 seconds, which will give you 340 seconds. So John ran 4 laps in 340 seconds. B wants to know how many seconds it took John per lap...We can find this by dividing 340 by 4 340/4 = 85.

A) 340 seconds

B) 85 sec/lap

skelet666 [1.2K]3 years ago

7 0

A)
$(5 \times 60) + 40 = 340s$
b)
$340 \div 4 = 85s$

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My name is Ann [436]

Answer:

Yes

Step-by-step explanation:

Given,

Population mean Z = 600

Sample mean, µ = 586.50

Size of the sample, n = 10

Standard deviation, σ = 26.77

The testing hypothesis is,

Null hypothesis = µ<600

Alternative hypothesis = µ≥600

The test statistics is the calculated value of Z,

(Z- µ)/(σ/√n)

= (600-586.50)/(26.77/√10)

= (13.5*3.1623)/26.77

= 42.691/26.77

= 1.5947

And at 5% level of significance, the table value of Z = 1.644

Here, calculated Z<Table value of Z, so we accept the null hypothesis.

So, the null hypothesis is accepted. The mean value of the laptop is less than 600.

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3 years ago

Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value u

Alenkasestr [34]

Answer:

The value is $1.75 \ and \ -1.75$

Step-by-step explanation:

From the question we are told that

The null hypothesis is $H_1 : \mu \ne 3.24$

The level of significance is $\alpha = 0.08$

From the z table the critical value of $\alpha$ considering the two tails of the normal curve( This is because this a two tailed test ) is

$z= \pm 1.75$

Hence the critical value is

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3 years ago

Jake recorded a temperature of 9 degrees Celsius, and Kwan recorded a temperature of -22 degrees Celsius. How much warmer was th

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3 years ago

10 increased by the quotient of a number and 6 is 15

Makovka662 [10]

<h2>Verbal Phrase to Mathematical Phrase</h2><h3>Answer:</h3>

$10 +\frac{n}{6} = 15\\$

<h3>Step-by-step explanation:</h3>

Let that number be $n$ .

The quotient of a number and $6$ is $\frac{n}{6}\\$ .

"Increased" is just another term for "plus (+)" so $10$ increased by The quotient of a number and $6$ is $10 + \frac{n}{6}\\$

And it tells us that it is $15$ so it must be $10 +\frac{n}{6} = 15\\$

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3 years ago

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Leona [35]

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6/(x-1)-5x/4
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3 years ago