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3 years ago

An unprepared student makes random guesses for 6 multiple choice questions that have selections a -

Mathematics

1 answer:

kirill [66]3 years ago

6 0

<span>P(at least 1 ) = 1 - P(exactly none) = 1 - (4/5)^6 = .738
Hope this helps!!!:)</span>

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Lindy puts £ 78 into an account which pays inrerest at a rate of 5% per anum. What will be the simple interest after 6 years .wh

Alika [10]

Answer:

Interest: £23.4

Amount: £101.4

Step-by-step explanation:

6 × 5/100 × 78 = 23.4

Balance: 78 + 23.4 = 101.4

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3 years ago

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Find two consecutive numbers whose cubes produce a sum of 1241

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8 and 9

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3 years ago

A political polling agency predicts candidate A will win an election with 63% of the votes. Their poll has a margin of error of

scoray [572]

Answer:

56% ≤ p ≤ 70%

Step-by-step explanation:

Given the following :

Predicted % of votes to win for candidate A= 63%

Margin of Error in prediction = ±7%

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Let the interval = p

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|p - prediction| = margin of error

|p - 63%| = ±7%

Hence,

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Lower boundary : p = - 7% + 63% = 56%

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Lower boundary ≤ p ≤ upper boundary

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3 years ago

A reading specialist wanted to estimate the mean word length, in number of letters, for an elementary school history textbook. T

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2 years ago

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At a high school, students can choose between three art electives, four history electives, and five computer electives. Each stu

V125BC [204]

Answer:

$\frac{^3C_1\times ^4C_1}{^{12}C_2}$

Step-by-step explanation:

Given,

Art electives = 3,

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Also, the total combination of choosing any 2 subjects out of 12 subjects = $^{12}C_2$

Hence, the probability that a student chooses an art elective and a history elective = $\frac{\text{Total combination of choosing an art elective and a history}}{\text{ Total combination of choosing any 2 subjects}}$

$=\frac{^3C_1\times ^4C_1}{^{12}C_2}$

Which is the required expression.

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3 years ago

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