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Aleonysh [2.5K]
3 years ago
10

Need help on this is mathhhhhhhhhhhhhhhhhhhhhhhhh

Mathematics
1 answer:
pychu [463]3 years ago
8 0

Answer:

38 cm

Step-by-step explanation:

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In the past, the average age of employees of a large corporation has been 40 years. Recently, the company has been hiring older
earnstyle [38]

Answer:

Step-by-step explanation:

In the past, mean of age of employees

i.e. \mu = 40

Recently sample was taken

n = sample size = 60

Mean of sample = 45

Std dev of sample s = 16

H_0: \bar x = 40\\H_a: \bar x >40

(Right tailed test)

Since only population std deviation is known we can use t test only

Std error = \frac{s}{\sqrt{n} } \\=\frac{16}{\sqrt{61} } \\=2.049

Mean difference = 45-40 =5

Test statistic t=\frac{5}{2.049} \\=2.441

df = 60

p value =0.008739

Since p < 0.05 we reject null hypothesis

The mean age has increased.

5 0
3 years ago
Sing fitness evaluations to determine fitness levels is important to __________.
olga_2 [115]

Answer:

D, All of the above.

Step-by-step explanation:

(A. set fitness goals

B. track performance

C. spot areas for improvement)

mark brainliest ??

6 0
3 years ago
Ted practices two types of swimming styles for a total of 50 minutes every day. he spends 20 minutes more practicing the breast
cluponka [151]

Answer:

see below

Step-by-step explanation:

butterfly = x minutes

breast = y minutes

total is 50 minutes

breast stroke = butterfly +20

Part A

x+y = 50

y = x+20

Part B

Substitute the second equation into the first

x+ (x+20) = 50

2x+20 = 50

2x+20-20 = 50-20

2x = 30

2x/2 = 30/2

x = 15

y = x+20

y = 20+15

y = 35 minutes

35 minutes on the breast stroke

Part C

45 minutes on the butterfly is not reasonable

We only have a total of 50 minutes

50-45 = 5

But he spend more time on the breast stroke ( 20 minutes more), but if he spend 45 minutes on the butterfly, he would have to spend less on the breast stroke.

4 0
3 years ago
Please help!!!
Kipish [7]
F - 12 = -35
f - 12 + 12 = -35 + 12
f = -23
3 0
3 years ago
Mr. Hebert is trying to load a square table into his van. He needs to lay the table flat. The
Lelechka [254]

Answer: yes because you can open the door more and the tables isn’t that big

Step-by-step explanation:

3 0
3 years ago
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