A notebook costs £1.40, a pen costs 37p , a pencil costs 24p and a sharpener costs 77p.

2 answers:

8 0

£9 - 90p = £8.10

2 Pencils = 48p
3 Pens = £1.11
3 Sharpeners = £2.31
All together = £3.90
£8.10 - £3.90 = £4.20

£4.20 / £1.40 = 3

Answer = 3 Notebooks

Yuri [45]3 years ago

7 0

Answer:

Remi bought 3 notebooks

Step-by-step explanation:

Let n = number of notebooks.

2 pencils cost 2 * £0.24 = £0.48

3 pens cost 3 * £0.37 = £1.11

3 sharpeners cost 3 * £0.77 = £2.31

n notebooks cost n * £1.40 = £1.4n

The total cost is £9 - £0.90 = £8.1

0.48 + 1.11 + 2.31 + 1.4n = 8.1

1.4n + 3.9 = 8.1

1.4n = 4.2

n = 3

Answer: Remi bought 3 notebooks.

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A set of middle school student heights are normally distributed with a mean of 150 centimeters and a standard deviation of 20 ce

julsineya [31]

Answer:

The proportion of students whose height are lower than Darnell's height is 71.57%

Step-by-step explanation:

The complete question is:

A set of middle school student heights are normally distributed with a mean of 150 centimeters and a standard deviation of 20 centimeters. Darnel is a middle school student with a height of 161.4cm.

What proportion of proportion of students height are lower than Darnell's height.

Answer:

We first calculate the z-score corresponding to Darnell's height using:

$Z=\frac{X-\mu}{\sigma}$