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aleksklad [387]
3 years ago
8

On a primary school parents were asked the number of hours they spend to help their children in home work there were 90 parents

who helped 1/2 hour to 1 1/2 hours . 20% of parents helped more than 1 1/2 hours 30% said that they helped for 1/2 hour to 1 1/2 hours per day the rest 50% did not help at all
(i)how many parents were surveyed
(ii)how many said they did not help
Mathematics
2 answers:
puteri [66]3 years ago
7 0

50 parents were surveyed

20 said they did not help

plz mark brainly

plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

lilavasa [31]3 years ago
5 0

Answer:

Step-by-step explanation:

Let x be the number of parents surveyed.

30% of x = 90

\frac{30}{100}*x=90\\\\x=90*\frac{100}{30}=3*100=300\\

Total number of parents surveyed = 300

Number of parents who did not help = 50%of 300

=\frac{50}{100}*300=50*3=150

Number of parents who did not help = 150

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Roughly around 21 rows.

21 x 15 = 315 bulbs planted

322 - 315 = 7 bulbs left over

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A sample size of 500 is sufficiently large enough to conclude that the sampling distribution of the sample proportions is a norm
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Step-by-step explanation:

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8 0
3 years ago
Which subset of the real numbers contains the square root of 50
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3 0
3 years ago
joe has a ring weighing 14 grams made of an alloy of 14 % silver and the rest gold. he decides to melt down the rings and add en
Nataliya [291]

With the help of the ratio method, we conclude that 72 grams of sugar should be added.

<h3>What is Ratio Method?</h3>
  • In the ratio method, we compare two quantities by equating their two ratios; this equation is also referred to as a proportion.
  • The cross-multiplication method will be used to solve it.

So, 'n=5' will be the number of rings.

  • 'w = 18 grams' will be the weight of each ring.
  • Total weight: w₀ = n × w = 5 × 18 = 90 grams

Let 's' be silver. Then,

  • New weight: wₙ = s + 90
  • Old % of gold: p₀ = 90% = 0.9
  • New % of gold: pₙ = 50% = 0.5

Now, use the ratio method as follows:

  • \frac{w_o}{w_n}=\frac{p_n}{p_o}
  • \frac{90}{s+90}=\frac{0.5}{0.9}
  • 90 × 0.9 = 0.5 × (s + 90)
  • 81 = 0.5s + 0.5 × 90
  • 81 = 0.5s + 45
  • 81 - 45 = 0.5s
  • 36 = 0.5s
  • 36/0.5 = s
  • 72 = s
  • So, s = 72

Therefore, with the help of the ratio method, we conclude that 72 grams of sugar should be added.

Know more about Ratio Method here:

brainly.com/question/26027272

#SPJ9

The correct question is given below:
A jeweler has five rings, each weighing 18 grams, made of alloys of 10% silver and 90% gold. He decides to melt down the rings and add enough silver to reduce the gold content to 50%. How much silver should he add?

3 0
2 years ago
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