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KengaRu [80]
3 years ago
8

Scores of an IQ test have a bell shaped distribution with a mean of 100 and a standard deviation of 20. Use the empirical rule d

etermine the following.
A. What percentage of people have an IQ score between 40 and 160?
Mathematics
1 answer:
vova2212 [387]3 years ago
4 0
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A phone company offers two monthly plans plan A cost $9 Plus And additional 0.12 $ for each minute of calls. Plan B cost $27 plu
Alisiya [41]

Answer: They will charge same amount for 360 minutes of calls.

Step-by-step explanation:

A phone company offers two monthly plans plan A cost $9 Plus And additional 0.12 $ for each minute of calls. Plan B cost $27 plus an additional $0.07 for each minute of calls

For what amount of calling do the two plans cost the same?

Let the each minute of calls be 'x'.

So, for plan A would be

plan A cost $9 Plus And additional 0.12 $ for each minute of calls is expressed as

y_1=9+0.12x

Plan B cost $27 plus an additional $0.07 for each minute of calls is expressed as

y_2=27+0.07x

According to question, it becomes,

y_1=y_2\\\\9+0.12x=27+0.07x\\\\0.12x-0.07x=27-9\\\\0.05x=18\\\\x=\dfrac{18}{0.05}\\\\x=360

Hence, they will charge same amount for 360 minutes of calls.

5 0
3 years ago
Hari borrowed Rs. 126000 from a money-lender at 15% per annum simple interest,
amid [387]

Answer:

Rs. 112000

Step-by-step explanation:

  • Borrowed money = Rs. 126000
  • Interest rate = 15% PA simple
  • Time = 3 years

<u>Hari is due to pay after 3 years:</u>

  • 126000* (1+ 3*15/100) = 182700

He pays Rs. 70700, remaining money is cleared by giving buffalo.

<u>Cost of buffalo:</u>

  • 182700 - 70700= Rs. 112000

<u>Answer is:</u> Rs. 112000

7 0
3 years ago
Read 2 more answers
Find the height of the building to the nearest foot in the diagram below. Show work.
stira [4]

Answer:

height : 150 feet

Step-by-step explanation:

\sf \sf tan(x)= \dfrac{opposite}{adjacent}

using tan rule:

\hookrightarrow \sf tan(62)= \dfrac{b}{80}

\hookrightarrow \sf b = tan(62)*80

\hookrightarrow \sf b =150.46 \ feet

5 0
2 years ago
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Unit rate for $32.05 for 15 gal
Marysya12 [62]

Answer:

im having the same problem,

Step-by-step explanation:

maybe search it up on google and see what comes up

6 0
3 years ago
Find 10-3 write subtraction fact two ways
Natasha_Volkova [10]
10-3
10 took away from 3
6 0
3 years ago
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