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Zinaida [17]
3 years ago
6

Sam spent a total of $90 at the grocery store. of this amount, he spent $72 on fruit. What percentage of the total did he spend

on fruit?
Mathematics
2 answers:
mylen [45]3 years ago
4 0

Answer:

80%!

you can put the amount spent on fruit over the total and compare it to a percentage table!

vlabodo [156]3 years ago
4 0

Answer:

72/90 ×100

24/3× 10

80%

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A radio manufacturer believes that the length of life of WPPX model radio is normal with µ=12 years and σ=2.5 years. (a) What pe
kicyunya [14]

Answer:

(a) 5.48%

(b) 17.82 years

(c) 21.19%

(d) 15.21 years

Step-by-step explanation:

z = (x-μ)/σ,

where

x is the raw score

μ is the population mean

σ is the population standard deviation.

µ=12 years and σ=2.5 years.

(a) What percent of the radios will function for more than 16 years?

For x = 16

z = 16 - 12/2.5

z = 1.6

Probability value from Z-Table:

P(x<16) = 0.9452

P(x>16) = 1 - P(x<16)

1 - 0.9452

= 0.054799

Converting to percentage = 0.054799 × 100

= 5.4799%

Approximately = 5.48%

(b) Suppose the company decides to replace 1% of the radios. Find the length of the guarantee period. i.e. find X.

find the z score of the 99th percentile = 2.326

Hence:z = (x-μ)/σ

2.326 = x - 12/2.5

Cross Multiply

2.326 × 2.5 = x - 12

5.815 = x - 12

x = 12 + 5.815

x = 17.815

Approximately = 17.82 years

(c) What percent of the radios that will fail to satisfy the guarantee period of 10 years? , i.e. less than 10 years?

When x < 10

Hence,

z = 10 - 12/2.5

z = -0.8

Probability value from Z-Table:

P(x<10) = 0.21186

Converting to percentage

0.21186 × 100

= 21.186%

Approximately = 21.19%

(d) If 10% of the radios will function for more than X years, find X.

The z score would be : 100 - 10%

= 90th percentile z score

We find the z score of the 90th percentile = 1.282

Hence:z = (x-μ)/σ

1.282 = x - 12/2.5

Cross Multiply

1.282 × 2.5 = x - 12

3.205 = x - 12

x = 12 + 3.205

x = 15.205

Approximately = 15.21 years

4 0
2 years ago
In 1 through 4,use the standard algorithm to find the products.
Gennadij [26K]
I will help you if you show me what questions 1,2,3,4 are. 

6 0
3 years ago
HELP ME OUT PLEASE ITS DUE IN 5 MINS
mrs_skeptik [129]

The equation that can be used to find the number of wolves in the state on January 1 is w - 23 = 84

<h3>How to represent a situation with an equation?</h3>

A zoologist is recording the loss of wolves in her state. She notes the number of wolves, w, in the state on January 1. One year later, there were 84 wolves in the state, which is 23 fewer wolves than were in the state a year earlier.

The equation that can be used to find the number of wolves in the state on January 1 can be calculated as follows:

where

  • w = number of wolves in the state January 1.

Therefore, the equation to represent the situation is as follows:

w - 23 = 84

learn more on equation here: brainly.com/question/7411234

#SPJ1

5 0
1 year ago
Nate works at least 4 hours but not more than 9 hours. He earns $12.40 per hour. The function f(t) = 12.4t represents the amount
Mashcka [7]

The practical domain is all real numbers from 4 to 9, inclusive.

The practical range is all real numbers from 49.6 to 111.6, inclusive.

These are the correct options.

Explanation:

Given function is f(t) = 12.4t

Let us assume that Nate works 'x' hours so 4<x<9

And multiplying the hours with his earnings we get the range.

4*12.40=49.6 and 9*12.40=111.6. Let the amount earned be represented by y

Hence, domain can be represented as 4<x<9 and range can be represented as  49.6 < y < 111.6

7 0
3 years ago
Mr. Rodriguez bought a supply of 20 Reams of printer paper. Each Ream Contains 500 sheets of paper. How many sheets of printer p
Umnica [9.8K]
Multiply its 10'000 I hope this helps
4 0
3 years ago
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