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sweet-ann [11.9K]

3 years ago

6

A chef knows it will take two hours and fifteen minutes to prepare and cook a lunch. He starts preparing the lunch at a quarter

at a quarter to eleven in the morning. What time will lunch be ready

2 answers:

beks73 [17]3 years ago

7 0

Well simply minus fifteen minutes for each qauter

crimeas [40]3 years ago

3 0

It will be ready by 1 o clock :)

Hope this helps

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Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation i

Mnenie [13.5K]

Answer:

The population mean = sample mean = x`= 67.5

Population standard deviation = 13.369

Sample standard deviation= 4.225

Step-by-step explanation:

AS the population mean is not given we will calculate it from the sample.

The mean of the sampling distribution is equal to the population mean .

The sample mean is calculated by

x`= ∑x/n= 75,+ 62, +69,+65,+66,+64, +67,+70,+74 + 63/10

x`=675/10= 67.5

The standard deviation of the sample is equal to

u = σ/ √n where σ is the population standard deviation and n is the number of observations.

Calculating the sample mean

s= √∑xi²/n- (∑x/n)²

s= √(45741/10)- (675/10)²

s= 4.2249

σ= u*√n= 4.229 *√10

σ=13.360

3 0

2 years ago

He scored 3 goals at Saturdays gams and scored 5 goals in yesterdays game . What is his percent of increase?

trasher [3.6K]

Answer: his percent of increase = 66.66%

Step-by-step explanation:

percent of increase = Increase/ Previous goal x 100

Previous goal = 3 goals

Yesterday's goal = 5 goals

Percent of increase = (5-3) / 3 x 100

=2/3 x 100

=0.6666 x 100

=66.66%

5 0

3 years ago

Find the limits<br>The answer is - 3/4

Kipish [7]

Hello from MrBillDoesMath!

Answer:

This is a puzzling one! The answer is indeed -3/4 but I was unable to prove it using mathematics appropriate to the "middle school" level. Sorry I couldn't be more helpful.

(To prove it I generated the first few terms of its Laurent series, a Calculus topic. The first few terms are -(3/4) + (41/64x) + and as x approaches minus infinity the term with "x" in the denominator goes to zero, leaving the constant value -3/4 as the answer. )

Thank you,

MrB

8 0

3 years ago

A drawbridge will sometimes open up to let boats and other water traffic pass through. As it opens, the surface of the drawbridg

olasank [31]

16.6 meters D on apex

3 0

3 years ago

Read 2 more answers

What is the slope intercept form of the perpendicular line to the line with (-2,7), (0,1) and (2,-5) points

MAVERICK [17]

Answer:

Step-by-step explanation:

Slope of line through the three points is -3.

Slope of any perpendicular through the line is ⅓.

(0,1) is one of the points on the line, so the y-intercept is 1.

Slope-intercept equation for line of slope ⅓ and y-intercept 1:

y = ⅓x+1

6 0

2 years ago