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elixir [45]
3 years ago
14

Felipe Vasquez bought some 14₵ stamps and the same number of 22₵ stamps. He paid a total of $1.80 for all the stamps. How many o

f each kind did he buy?
Mathematics
1 answer:
Kazeer [188]3 years ago
7 0

he bought 5 of each stamps because

5 x 14 = 70

5 x 22 = 110

110 + 70 = 180

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Answer:

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Step-by-step explanation:

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2 years ago
You ask a neighbor to water a sickly plant while you are on vacation. Without water the plant will die with probability 0.75. Wi
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Answer:

0.2915

Step-by-step explanation:

Let W represent water and D represent Dying probability

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P(W ' & D) = 0.18 x 0.75 = 0.135

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4 0
3 years ago
An urn contains a very large number of marbles of four different colors: red, orange, yellow, and green. A sample of 12 marbles d
Umnica [9.8K]

Answer:

We  can reject the hypothesis at the 0.05 significance level.

 

Step-by-step explanation:

given that an urn contains  a very large number of marbles of four different colors: red, orange, yellow, and green. A sample of 12 marbles drawn at random from the urn revealed 2 red, 5 orange, 4 yellow, and 1 green marble.

H0: All colours are equally likely

Ha: atleast two colours are not equally likely

(Two tailed chi square test at 5% significance level)

color                  Red           Orange      Yellow      Green         total

Observed  O         2                     5                  4           1              12    

Expected   E         3                     3                   3          3              12

(O-E)^2/E             0.3333            5.3333        0.3333  5.3333     11.3333

chi square = 11.3333

df =3

p value = 0.010055

Since p < 0.05 we reject H0

We  can reject the hypothesis at the 0.05 significance level.

 

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