Daniel C

http://www.facebook.com/photo.php?fbid=18022618945...

sorry i had to link it to facebook, if its ok with you guys and i hope u all have accounts

Thanx :)

Twenty years of an objects journey seems to be forty when measured from Earth. How fast is the object moving relative to the Earth?

thanx pplz

hi everyone...

ive been coughing for 3 months already with shortness of breath wheezing and producing alot of mucus. i think it started out with a cold but it didnt seem to ease off. i spent the whole christmas school holidays at home sick and even though im at school, i normally bring a asthma inhaler just incase.

im not so sure whats wrong with me though

ive been to so many doctors...taken amoxil, augumentin and roxymicin(which i found out i was allergic to)

many doctors say i have different illnesses:

-asthma

-post-nasal drip

-upper respiratory tract inflammation

-nocturnal asthma

plz help.

hi..im not sure how to do standard deviation plz help. dont worry if you cant answer them all. thanks.

1.A country town instals 2000 new electric lights in a new housing estate. These lamps have an average life of 1000 hours with a standard deviation of 200 hours.

a) What percentage of bulbs would be expected to fail between 800 hours and 1200 hours? How many bulbs would this be?

b) How many bulbs would be expected to last longer than 1600 hours?

2.In a kindergarten class of 40 children the average foot length was calculated to be 10.5cm with a standard deviation of 0.5cm.

a) what percentage of lengths are

i) between 10cm and 11cm?

ii)less than 10cm?

iii)more than 11.5cm?

iv) between 9cm and 12cm?

b) How many children (nearest whole number) have foot lengths;

i) between 10cm and 11cm?

ii) less than 10cm?

3.A manufacturer of zinc plated nails manufactures a certain type of nail of mean length 3.8cm, with standard deciation 0.02cm. Gauges reject all nails longer than 3.84cm or shorter than 3.76cm. WHat percentage of nails are rejected? In a run of 10 000 nails , how many (nearest whole number) would you expect to be rejected? If one nail is selected at random, what is the probability that it would NOT be rejected?

4.Consider the set of five numbers 8, 3, 7, 4, 3.

a) Add five to each number in the group. How does this change the mean and standard deviation?

b) Multiply each of the numbers by five. How does this alter the mean and standard deviation?

thank you for helping if you can .

hi pplz, im 14, turning 15 in 3 days and my b'days on valentines day.

anyone got any ideas on what i can do...and the last 16 answers i got before involved something erotic...its a saturday and im stuck at home once again..bored out of my mind..

give me a few hints on what i should do..

(10 points for best answer)( thumbs up for everyone)<------------cause im in a sort of happy mood

just wondering...anyone else also share the same b'day as me?

factorise this

a^4 - a^2 - 2a + 2

well i'm not sure if i have a whooping cough or not. it started off with flu like symptoms and that's over but then i was left with a month of coughing. im kept awake at night coughing and wheezing for the past 2 weeks. my doctor prescribed Roximycin tablets ( for fungal infections ) without knowing the main cause for the sickness.

im not sure whether whooping cough occurs throughout the whole day since i have coughing attacks only at night.

plz help.

((x^-1+y^-1)/x+y) - ((x^-1-y^-1)/x-y)

The numbers of tables in a restaurant varies inversely with the distance between them. When they are 10m apart, the restaurant can accommodate 48 tables. For a distance between the tables of 16m, how many tables can be arranged?

solve as a fraction : 81^(1-2x)=1/9root3