a bag contains 6 blue coins and 4 red coins. a coin is removed at random and replaced by three of the other color.

part 1
what is the probability that the removed coin is blue? enter your answer as a simplified fraction.

the probability that the removed coin is blue is 3/5

part 2 out of 3
if the first coin removed is blue, what is the probability of drawing a red coin after three red coins are put in the bag to replace the blue one?

the probability of drawing a red coin after three red coins are put in the bag to replace the blue one that has been removed is

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Lems1. the following data set represents the scores on intelligence quotient(iq) examinations of 40 sixth-grade students at a particular school: 114, 122, 103, 118, 99, 105, 134, 125, 117, 106, 109, 104, 111, 127,133, 111, 117, 103, 120, 98, 100, 130, 141, 119, 128, 106, 109, 115,113, 121, 100, 130, 125, 117, 119, 113, 104, 108, 110, 102(a) present this data set in a frequency histogram.(b) which class interval contains the greatest number of data values? (c) is there a roughly equal number of data in each class interval? (d) does the histogram appear to be approximately symmetric? if so, about which interval is it approximately symmetric?

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c