lyoung17
28.01.2020 •
Mathematics
Suppose ages of people who own their homes are normally distributed with a mean of 42 years and a standard deviation of 3.2 years. approximately 75% of the home owners are older than what age?
38.2
39.9
44.2
48.6
the scores for a bowling tournament are normally distributed with a mean of 240 and a standard deviation of 100. julian scored 240 at the tournament. what percent of bowlers scored less than julian?
10%
25%
50%
75%
the odometer readings on a random sample of identical model sports cars are normally distributed with a mean of 120,000 miles and a standard deviation of 30,000 miles. consider a group of 6000 sports cars. approximately how many sports cars will have less than 150,000 miles on the odometer?
300
951
5048
5700
Solved
Show answers
More tips
- L Leisure and Entertainment Should You Buy a Ceramic Knife?...
- C Computers and Internet How to easily and quickly disable Firebug in Gmail and Google Docs...
- G Goods and services How to sew a ribbon: Tips for beginners...
- F Food and Cooking How to Make Mayonnaise at Home? Secrets of Homemade Mayonnaise...
- C Computers and Internet Which Phone is Best for Internet Surfing?...
- F Food and Cooking Everything You Need to Know About Pasta...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
Answers on questions: Mathematics
- M Mathematics A person invests $6,500 dollars in a bank. The bank pays 6.5% interest compounded continuously. To the nearest tenth of a year, how long must the person leave the money in the...
- M Mathematics 4,950 is the answer and the answer...
- M Mathematics By car john traveled from his house to miami florida in 6 hours going 14 mph faster elliot can drive from his house to miami florida in 5 hours what is the distance from johns...
- M Mathematics 2a squared+3a+1 how do i factor the trinomial of this equation?...
- M Mathematics Solve for y: 2y+10 over t equals t2...
- M Mathematics Plz it’s really hard but i can’t do it...
- M Mathematics Trevon had $24 to spend on 5 pens after buying them he had $4 how much did each pen cost...
- M Mathematics The temperature in degrees fahrenheit can be expressed by the function f(c)=9/5c+32 where c is the temperature in degrees celsius. find the temperature in degrees fahrenheit (to...
- M Mathematics Igive ! : ) i give 5 stars and stuff like that ; p question is the picture...
- M Mathematics X- 6 translates as a number subtracted from 6. true false...
Ответ:
1 - P(z < (x - 42)/3.2) = 0.75
P(z < (x - 42)/3.2) = 0.25
P(z < (x - 42)/3.2) = P(z < -0.6745)
(x - 42)/3.2 = -0.6745
x - 42 = -2.1584
x = -2.1584 + 42 = 39.84 ≈ 39.9
P(z < (240 - 240)/100) = P(z < 0) = 0.5
Required percentage = 50%
P(z < (150,000 - 120,000)/30,000) = P(z < 1) = 0.84134
Required number of cars = 0.84134 x 6,000 = 5,048
Ответ:
Cool but what is your last question